Malicious PDF — malware analysis report

Static analysis result for SHA-256 c823fd55cc76567b…

MALICIOUS

PDF

93.4 KB Created: 2021-03-19 16:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 92d42f810766058bb0cecca1236df628 SHA-1: f68e56619b287e24083d91453a433adce47afdfe SHA-256: c823fd55cc76567b0b5b80b3a723e8b2aaa15eecadc07440c0697a7bfa7ed48e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/award?keyword=petty+cash+book+problems+and+solutions+pdf PDF link annotation
    • https://jodeliloku.weebly.com/uploads/1/3/5/9/135975589/vegumawamuweze-nolid-fireda.pdfIn PDF document text
    • https://kosemezaped.weebly.com/uploads/1/3/4/7/134711049/mubuwan.pdfIn PDF document text
    • https://jopakawinotu.weebly.com/uploads/1/3/1/4/131407654/bemipa_bipomofodisil_wapakazexuruxal.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/encuesta_habitos_alimenticios.pdfIn PDF document text
    • https://jodutofafedabaf.weebly.com/uploads/1/3/1/4/131452959/tewusogedi.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/lisawovemaraxaxobam.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/magic_tree_house_merlin_missions_book_level.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/26621427643.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/50192884229.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/woletosudugo.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/5143898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xawixojupaxixan.onlinewebshop.net/29202170653.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_8a375188fc3b4f24acfdfcf0df99e935.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/19045822350.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_500e20d8ed644dd9ba9be829c2c6c540.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_aa60293091244af0a73be9c6c4cdd938.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_2e9ac90f74e448c5a3ad78b68758324a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/zokojekidu.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_2ab37072d952458190d4f03ef0d7f951.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_f572944ef7404b12908d0e2e485c2690.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5700 bytes
SHA-256: b1383709da486b2c9e1565713fd70a36cb8a41cb905c38807cdae6590ba21854
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 3852 bytes
SHA-256: bab409afe3c8865ebc5a9c997a7c4378b4f92ef5165b900e12cd9fba1f26d62c
font_02_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 2800 bytes
SHA-256: 1fe8b5a92c166e512656d86ad50560a9ebd38fe4dbee5671ff8f7d8424607e38
font_03_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 11732 bytes
SHA-256: e4f22530c1a8665ef21a324bdbf69140e4814f3a7d6732d4768ae45e9fb85629
font_04_sfnt_off00014170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14170 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_05_sfnt_off000156c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C3 4252 bytes
SHA-256: d43f156d622ce701bbfa73602ba81c621253b82f8ed519777c1e3db9d17aecf2

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