Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86dcb0db572e395…

MALICIOUS

PDF

132.0 KB Created: 2021-04-04 13:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1a31b420df744d2a2b43525a8163283a SHA-1: b87974d712555edb2a80b808f68c0ab6658ed1b1 SHA-256: c86dcb0db572e395fc258b3b76285bafe65c942c239c2d8dd93d371991c64c1a
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 0.9998

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://fokemale.ru/aws?utm_term=when+did+the+great+depression+roughly+begin+and+end PDF link annotation
    • https://cdn.sqhk.co/tikalamin/5CDNgWk/seliwud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_603d89b805389.pdfIn PDF document text
    • https://cdn.sqhk.co/sevilebup/hfS9jge/caption_for_self_photos_on_facebook.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/niwidap-xuwamoriwipugi-zotesarogut-vejup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_603c8254aba96.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/9420095.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/7848551.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/wirokufewaji-zikitufapow-zivukemobusepuw-fifugo.pdfIn PDF document text
    • https://lapomuxonadaxo.weebly.com/uploads/1/3/4/5/134584049/kutagujivivar_gatitifeliwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/809333b2-331e-4a1a-9271-dd719d75ccfb/mimawaletanemukol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be5b824-9a25-4676-bac4-1193b99b6dfa/apple_books_para_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41ab7fb-2076-4a92-8600-559dc221fae1/tojodisizanezape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7541b744-d543-4408-aa65-72d5793a8dd7/subtraction_with_regrouping_place_value_blocks.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/tom_clancy_rainbow_six_las_vegas_3.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/harry_potter_hardback_book_set_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e8f75a-3d3b-4662-83c6-4323207c5915/dark_souls_4k_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/surge_arrester_in_transformer.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_off0001c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9AF 5476 bytes
SHA-256: cf323d676f1fed6b36ea480550c41c988cde9ee0232d0a73f35fb07aa9204da6
font_01_sfnt_off0001dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC52 11044 bytes
SHA-256: dacb396c12b7513486660934d046e86675afa409962aafacaa878326051d927e

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