Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a40d5e19fd68c93…

MALICIOUS

PDF

73.0 KB Created: 2020-12-13 21:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5966611679300e7952667fb25931fe1a SHA-1: 173c1de511c61fb0acf049ed190ad5f3833636a4 SHA-256: 9a40d5e19fd68c93e884b15766ef92f541136bc9daabef8e152914d6e11da233
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to 'pub quiz questions'.

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 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://traffnew.ru/aws?utm_term=pub+quiz+questions+and+answers+capital+cities PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fd393f05f3c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5fa244ae8e778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5fa76c8d23856.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/5226046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fa487931c799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f86f9722771d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc37324df132613bbcddee0/t/5fcf9c9910aae7757177d1c6/1607441561838/49073741239.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ade9d79364840856e8b/1606376159218/76756297800.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc654e0affbf90a660f952b/t/5fd65657481cfa31adc5e0b6/1607882327747/formation_aiguilleur_du_ciel_toulouse.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b3b3085bf90c0e02b495/t/5fc5ab7beaf37e3b64603975/1606790012038/honda_gc190_shop_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc783a843c5ee75bf2ca75b/t/5fd64ad072b1137fa9729418/1607879381512/95138410705.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ec1b7848ba205d25c866/t/5fc70b0093ad1a4812123502/1606880001605/rotijakovulelamed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fed0114-dc65-452b-b461-e68d69772808/bobugovagu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0de9c5bcb0228a2825217/t/5fc324c408845d0924f0ba2c/1606624457382/dffoo_tier_list_reddit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3e0aef9866f3fd2e6cd3c/t/5fca65632dd5445090c91331/1607099747228/kubifizivolo.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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 5476 bytes
SHA-256: a73ee7ae17aaacec7cba4dc63fe2910690ef0ee1b4a86b16c14be0cb08f9647b
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10408 bytes
SHA-256: a1f893d98b14976097a2e019db055da207fb1a413b4ba21bc27c90fb94d38313

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