Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4af6bc10ad76d97…

MALICIOUS

PDF

97.8 KB Created: 2021-03-18 23:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3a50ae74252190f9d6cd0703580ee062 SHA-1: 984f8b0c8ab132ddd9614256fdd4f004098aadab SHA-256: d4af6bc10ad76d97a2c5400fb1a55979bd4ad855e2700c3e1272abcdd654ce7f
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 pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=ncsu+summer+session+2020 PDF link annotation
    • http://nepatokada.mypressonline.com/20018049152.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/5204803.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/57d5ff2deee0b4.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/libros_de_bienestar_laboral.pdfIn PDF document text
    • http://ligelasew.iblogger.org/summer_escapes_pool_pump_installation.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/fuganipubudef-tulotanumugelak-ziliguseka-genivep.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/6035442.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/what_are_the_hero_ranks_in_one_punch_man.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/kezavizesub-jagizizos.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/lusixan-xuzeguwap-rusevovabekotu-ligawunelu.pdfIn PDF document text
    • https://demegokesikamo.weebly.com/uploads/1/3/1/4/131454383/4865042.pdfIn PDF document text
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/7cb8887aae1d918.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/fda362.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/eduardo_galeano_biografia.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/zebefuza.pdfIn PDF document text
    • https://gufonesugoxemi.weebly.com/uploads/1/3/5/9/135960051/kodevorakadanaramise.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/081217d6e21.pdfIn PDF document text
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/jalugevevodu.pdfIn PDF document text
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/ruduxi.pdfIn PDF document text
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/4779234.pdfIn PDF document text
    • https://tekejixebosij.weebly.com/uploads/1/3/1/4/131452745/5251701.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://zanixav.rf.gd/gugixokevakokuf.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/arrl_antenna_book_21st_edition.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 4748 bytes
SHA-256: 67d47dd276ad954feea70de3307c90304284765f3cf6da7031ef28f860bdc8c6
font_01_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 11028 bytes
SHA-256: a4ce3bb95024d7c1e2be76750fc51691bfd12a8a4804841c140841a2607bb95e
font_02_sfnt_off00015604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15604 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_03_sfnt_off00016b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B33 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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