Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fce82815b5b1a8…

MALICIOUS

PDF

82.1 KB Created: 2021-05-01 20:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3d9e89d093d6d27f1eb590c21d6388 SHA-1: b1f0939e37a1d6f9fd7af2768ab734786a6e55ee SHA-256: a0fce82815b5b1a8b887212766d9b069980bd39de3ee0604753d6c1c313948f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Tefal pressure cooker specifications'. The presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=tefal+pressure+cooker+specifications
    • https://cdn.sqhk.co/nomavunut/cidgd6K/yellow_finch_bird_symbolism.pdf
    • http://ruwosiju.getenjoyment.net/jibirixakalokin.pdf
    • https://cdn.sqhk.co/bitowiso/hjfjaag/fc_bayern_munich_logo_dream_league_soccer.pdf
    • https://cdn.sqhk.co/galudubujuwa/9OhaqwN/40629931298.pdf
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/dawavixaz.pdf
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/56ef4e9558.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/what_the_meaning_of_admission_rate.pdf
    • https://cdn.sqhk.co/parabeset/fv3Ljgj/mogumipidopijikowakitaf.pdf
    • https://cdn.sqhk.co/tuzevawu/eKmjgSa/65177655909.pdf
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/semejumuzilus.pdf
    • https://cdn.sqhk.co/rosavuzezig/dROgjie/gepokekasisikiwuxizulelin.pdf
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/086747b874f55.pdf
    • https://tagenomamoz.weebly.com/uploads/1/3/4/4/134476715/981c53ab3e1ac1.pdf
    • https://cdn.sqhk.co/fumamimed/9CgcihN/luvawite.pdf
    • https://cdn.sqhk.co/vomuvojovi/fvjfvih/sales_receipt_book_walmart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xijilesuzuxo/vunofopi.pdf
    • https://04650017-3ca5-4b28-9d9b-11da2816551d.filesusr.com/ugd/aa03de_b9979b28dd11483ebc99119a050a6b8f.pdf?index=true
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_c2c7e3d70326414e9623185fd163bd71.pdf?index=true
    • https://s3.amazonaws.com/dinilederu/qualis_capes_2016.pdf
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_68f1920347aa427bb0f5506d3a5ed818.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_532822615c1d45a6a9904148dd4f6ff3.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_cf68c7d3ba5f4454a32c0af15592a238.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010276.bin
108ce3303ca89c3d31670556a800ddb5f879b367116fcc28352edc365f1f7971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 5024 bytes
font_01_sfnt_off000113a2.bin
4b2194c7a560ef407c6e5c3b59de1d23122f0dc0c19bb790644612cd3ccd3f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 11700 bytes

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