Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1fed67c6ef9b42…

MALICIOUS

PDF

86.4 KB Created: 2021-05-02 21:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5507b3c9679d1b815f7942fa4a2c4e70 SHA-1: 5ac2acfaf96f667236c6369ee09bacb0324b5abb SHA-256: ab1fed67c6ef9b42aec484cbb101f519fd91855f1bfe92cc18fa68dc46757ada
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=how+many+carbs+in+chick+fil+a+large+fries PDF link annotation
    • https://cdn.sqhk.co/rozopebak/9fpzhbt/nimuretiwavonunexitoked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_605dc834553a6.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/LJWgd0c/introduction_to_business_grade_10_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_603e716d57b39.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/84056480867.pdfIn PDF document text
    • https://cdn.sqhk.co/tusujoxaseru/jLiahiT/jekatibaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_603abffe2e4a7.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/83795570438.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/iyjcnBe/fufowotedigagikofazab.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/ifghyfp/34512136415.pdfIn PDF document text
    • https://cdn.sqhk.co/jumosanex/4hbbcij/wagabulujakoveponimi.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/hjdjcgK/18827782723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_6030d9c289744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remavuj/tiebreak_contact_ls_dyna.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/xatimagemikukugujipanozu.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_a496d25a29454601a67c5f5d15d07898.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_1eddf5c2e5de42bb8b8dc61cd6c67553.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_aeef9430f8f54281a133c07096e66e9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/lumugirorema.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/japinulu.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/sepujojewar.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/23471786836.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/walther_pk380_review.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 5652 bytes
SHA-256: 6e940105fdeb7064a7849d9fb8b2a853b609806c8aef0b63fb80bcebd369f43f
font_01_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 11080 bytes
SHA-256: 2e15a304fe84bbe9091ce55e147292eba44636eb25bf5b61c9536411fafb6478

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