Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3abcde19162e93…

MALICIOUS

PDF

78.6 KB Created: 2021-05-29 23:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 415fefaad40d17ad30b5c3f1d412fe2b SHA-1: 0494ed733cf69ef27651dfed81c13c3a5fd7d8a8 SHA-256: fb3abcde19162e932a7d78ff243a888456cf6f37f969370cc4b0e091f3db4983
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing and SEO link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI heuristics point towards the file's primary function being to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+program+a+tork+457z+timer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5fc7353703fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff79d200cb5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460690/normal_5ff4f0ebf19a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6020ae739ae7d.pdfIn PDF document text
    • https://neranutedaxujaw.weebly.com/uploads/1/3/1/4/131407849/7988868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_606d678daf80c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_6006ff49ed9af.pdfIn PDF document text
    • https://luradubesi.weebly.com/uploads/1/3/4/4/134486829/komanutezosok.pdfIn PDF document text
    • https://lusewixitakotaz.weebly.com/uploads/1/3/4/3/134385759/volagitobo-zejosilazi-kizupetu-xizaxute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6023fec497a24.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/f5622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_6009a896328a7.pdfIn PDF document text
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/5600448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_602d82d2af21e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_604bb92aa0007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_6003eb4f89dad.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/d8a08705-1d13-43d7-ba09-8817e59ca9ee/what_is_the_yellow_wallpaper_a_metaphor_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd74f65-57f4-4ac5-a248-7ffd324a665a/9563634422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8b8f0e-e6b3-4d43-ace9-ab4da5e65cca/2219729624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d353b6-8bec-4e89-87f4-49280190a537/19680904603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566b9db9-90fa-4a99-957f-31f874534183/why_would_an_immersion_heater_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dced59e-8917-4abe-9f4c-13ed47545d14/free_bible_study_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19b1c2e-b602-4671-8e9b-687d54060e93/bsa_scoutmaster_handbook_download.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_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 5388 bytes
SHA-256: 248fbf758eb68c7cf90778aff7616cf24681fbd94d878640539b2e4444747c81
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 11588 bytes
SHA-256: efadc389c19fb50263524fd46255d743ee53ded5082d6f2c8786faddc8ee396c