Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4af182fe69c660…

MALICIOUS

PDF

83.4 KB Created: 2021-03-22 06:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5e86b66d60053c6231926ee763ac6f49 SHA-1: 3b4df66941f5dfb4d2a8025ff1eaa415bff113b0 SHA-256: 5b4af182fe69c6606bb19bdcd24b0ab6dd5f72906d73ef955bce3202289a5ec5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/wix?keyword=balance+general+y+estado+de+resultados+ejemplos+pdf PDF link annotation
    • https://cdn.sqhk.co/depadukat/jdgc1hj/vitupisalopola.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/cWLKP3y/morovo.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/4235877.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/LjeL0Vh/18415633378.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/5th_grade_common_core_math_standards_checklist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_6025ec81b2762.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/3104348.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/adkibii/8255550575.pdfIn PDF document text
    • https://cdn.sqhk.co/fedukifenufu/fwdlMjc/xakutunusunisukixanosaka.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/hbgghc7/carga_segura_de_trabajo.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/jdHgfRS/idle_archer_mod_apk.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/33134256171.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/lumasovefag.pdfIn PDF document text
    • https://cdn.sqhk.co/wufaluvete/jieA58P/puzelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fe8f4706cc31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_5fd2f41a5df22.pdfIn PDF document text
    • https://zetokefukakebep.weebly.com/uploads/1/3/1/4/131438441/1355008.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fuxuxasezid.atwebpages.com/nisefepavaxibosojiruko.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_faf10679421d479a974518d29a03f53f.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_bbe5d94a04214adb947d04e384b79c6b.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_9490c5ce921c43689c0a110d3124a3c2.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_0f5366d70ba54f79ae97ae9f38f7d448.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 5536 bytes
SHA-256: e233cf008427a7d74dc3805beda09c5b7be16d853729482224fe0919c487ad5d
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 12112 bytes
SHA-256: da2af08c510e07f09ad961628ff64477d672d318d0c53e25a9b6dba936494b9c
font_02_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_03_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 6068 bytes
SHA-256: 4b45f33c909d1de4119f908b2e4eeec8b51571bcf8b126b8fe9c8b95bec6d9c2

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