Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0a1cf8c5df33a0…

MALICIOUS

PDF

82.8 KB Created: 2021-03-31 08:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5213eb489fc9ee7a913c0fd5a7a86a4e SHA-1: ecdc5455ea020073b6582a75a3502f72bb8fe8cb SHA-256: cd0a1cf8c5df33a0d77401cc24a636453e227886312a59db9fa1799db1cd9eda
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/wix?keyword=oathkeeper+keyblade+replica PDF link annotation
    • http://vixemifojetinag.sportsontheweb.net/68195904677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_6056fcbc3b3b4.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/conversin_pulgadas_a_cm_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5ff2e5770cdc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5fda829d9d4c4.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/a_defense_of_abortion_david_boonin.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/red_dead_redemption_achievement_guide_and_roadmap.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/piccadilly_line_map.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/tawaxowepuvofumulog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_60613ec0a196f.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/xovasodikibosugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_605c3ba258b04.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/28d96d95.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/096a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5fdefcbf37add.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/gavavubaripizetitulodowan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_6012b7ff7f1f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6017c066e6c72.pdfIn PDF document text
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/wupopiworitudili.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
    • https://s3.amazonaws.com/jujadodedaruxix/99153085962.pdfIn PDF document text
    • http://wenares.myartsonline.com/charter_communications_remote_jobs.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/xesatofetupikuz.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/waec_chief_examiners_report_2017_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/laser_cut_acrylic_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 4888 bytes
SHA-256: e175f3e7ec00ab364f6ab19d01506290c351babbc5babf4fded4ed699a750212
font_01_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 10536 bytes
SHA-256: 55e27cc323e024d9ef5062f9fef1836dfe5672f2f71336aea46db59c372be603
font_02_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f