Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c69dfa071a7ee80…

MALICIOUS

PDF

77.9 KB Created: 2021-05-06 20:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f5c04c6f316bd6d623ea5dc9fe11ae6 SHA-1: da039bd5fbef9e777eacb8b878d7e9cdd442bb06 SHA-256: 8c69dfa071a7ee8058a8b674026d57be4507c8ebc57671f4315bf47c7aeb1f26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://vilenefex.ru/strik?utm_term=rzr+1000+turbo+clutch+rebuild+kit PDF link annotation
    • http://pifozuvarivin.22web.org/635697889.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/bargaining_for_advantage_book.pdfIn PDF document text
    • http://pelegiromo.22web.org/blepharitis_eyelid_hygiene.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/b9e9017db.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/vufazebavur.pdfIn PDF document text
    • https://sadogadodewinog.weebly.com/uploads/1/3/4/3/134311907/3821494.pdfIn PDF document text
    • http://businessmentality.com/behringer_vocoder_vc340_manualb4qzq.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/kobemorino.pdfIn PDF document text
    • https://ruwegevenimeva.weebly.com/uploads/1/3/0/9/130969935/vuzedole_kulifes_lutox.pdfIn PDF document text
    • http://notdull-eng.online/did_america_have_a_civil_war3ljkk.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/mitewaw.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/66087008351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizavobamibo.rf.gd/2020_calendar_template_with_holidays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e571311c-8e15-4934-9401-c7f1c9b0f968/senior_software_project_manager_salary_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f428285-12ed-4960-aa75-dd1230a2daa4/kekanimegubaviriwojamiwer.pdfIn PDF document text
    • http://kedukalof.epizy.com/pasegajefezep.pdfIn PDF document text
    • http://fegugeg.rf.gd/vector_algebra_solved_problems.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 5096 bytes
SHA-256: 725bb6f9e94e906076045f9cf1a77f8e98a21bf826a60e819ef48c214da79fb1
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 11652 bytes
SHA-256: c120fe4106348b397b762996ab023bf0cf4cb79e3d81b83b0bf46644fd818b53
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 16204 bytes
SHA-256: 73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502