Malicious PDF — malware analysis report

Static analysis result for SHA-256 72373d1a5969e251…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 04:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5de77c5f86131f414e42d331805572c5 SHA-1: 72152474ad608c299d27aea0a5432c43db6686db SHA-256: 72373d1a5969e251a4adbe895ad40ed280261710a5e7b0041799cd9bb3429056
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The document contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggesting an intent to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=khi+dong+minh+nhay+vao PDF link annotation
    • http://kapusta.pro/tanuxidijitaxujuxakarove4z7ua.pdfIn PDF document text
    • https://cdn.sqhk.co/xujutitula/jd4uVQs/woziki.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/importance_of_cadastral_surveying.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/muximexokipaga_fidogumu_bivegi_fubiguwudabed.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/gib8Fic/modern_tractor_farming_simulator_offline_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/d5wMFgg/random_name_generator_for_among_us.pdfIn PDF document text
    • http://eushopvmn.site/98070602147i39g3.pdfIn PDF document text
    • http://7gusevshop.website/groover_robotics_industrialfj5i4.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/4667564.pdfIn PDF document text
    • http://wide-mean.top/gerogobobuxijuruwunanogu9u3an.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/africa_map_political.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junaken.onlinewebshop.net/32962485209.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/43966679604.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/vogunobefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4744162d-e192-49f3-bc05-0d47af3a40d1/fluval_306_media_order.pdfIn PDF document text
    • http://penanaras.myartsonline.com/abbyy_transformer_12_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8fb5bb-e112-4e9a-8597-9df5bae8bf56/52799892547.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/ajay_devgan_songs_free.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_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 5064 bytes
SHA-256: 8224312e952f488261376776c43660152d0f78cd87ee579f68bd7f2582f257c1
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 21868 bytes
SHA-256: 37b6baa399763234848a3900795266bb3e1d62cb2e934d5e1c66a0ce1778fc31

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