Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6169f1d787c6874…

MALICIOUS

PDF

69.5 KB Created: 2021-03-29 07:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57b5c5573887a046df43ec4d431fadd6 SHA-1: 5fef4a1bd19ac52735a565c5f4e0c92e45fadd2d SHA-256: d6169f1d787c6874c5d8e10f689f643c9e8e45ffe0f6bd1f3d1a152ce7e0a867
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phish users. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8212

Heuristics 5

  • 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.
  • 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
  • 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://leonvi.ru/award?keyword=konsep+dasar+pendidikan+agama+islam+pdf
    • http://vosojivaru.mypressonline.com/negative_prefixes_adjectives.pdf
    • https://cdn.sqhk.co/lewiwifo/FhiSgii/lego_jurassic_world_dinosaur_rampage_game.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/wotivowus_zupilepusuja_pubudeniwelok.pdf
    • http://jevufoduxixan.22web.org/kathi_sandai_songs_320kbps.pdf
    • http://jiwapadenejeza.getenjoyment.net/31840177389.pdf
    • https://jukuzowak.weebly.com/uploads/1/3/1/3/131379830/mowijififidixalorir.pdf
    • https://cdn.sqhk.co/rifusofuwedi/OoxlOhd/women_s_college_basketball_coaching_jobs_openings.pdf
    • http://fiwamixos.iblogger.org/armory_crate_service.pdf
    • http://tafuxasomup.getenjoyment.net/skilsaw_hd77m_power_cord.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajujiju/zalibixolu.pdf
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_51913581a45e41b4bcdcc8466b7621be.pdf?index=true
    • http://jeragapa.epizy.com/dupisipetolewusulujefox.pdf
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_703f48d8ebda4c1685cb80ab55687ee2.pdf?index=true
    • http://vijuzoluza.epizy.com/high_school_resume_template_free.pdf
    • https://s3.amazonaws.com/wutogugej/lozanulenejitusanije.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_6aadb6b7ae78494583dc39885eea8476.pdf?index=true
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_35ee70e631f04ffea2806e6f50ff57b4.pdf?index=true
    • http://vugugemo.atwebpages.com/how_to_apply_for_pregnancy_medicaid_in_ga.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb7.bin
8e825c5bb8670ec562801e571514bef66d772b27a586c3f82cc797c378ce9c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 5396 bytes