Malicious PDF — malware analysis report

Static analysis result for SHA-256 055d6e62e16ee91e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-14 04:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67f2e4fd6e351f5a6c679cfd3c149569 SHA-1: eeffa44d4057b2ae53f9c0b3f07b8b326465efa4 SHA-256: 055d6e62e16ee91e1f397c9bc42b7b580a1d333854a3bd58660fcce045b31205
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 point to other PDF files, indicating a link farm for SEO manipulation or phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of embedded URLs and the overall structure suggest an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=calculus+3+pdf+notes
    • https://cdn.sqhk.co/pedajobu/hgjhiPm/chapter_9_labor_market_trends_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4420030/normal_603784162c22f.pdf
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5ff5a4bd3d3ff.pdf
    • https://varozowixofifop.weebly.com/uploads/1/3/0/8/130814066/6a274.pdf
    • https://sagekafota.weebly.com/uploads/1/3/4/3/134351395/jukaxurobal-gogokineba-zofupulo-semobimeriwo.pdf
    • https://vuxosulaleko.weebly.com/uploads/1/3/2/6/132695375/6309640.pdf
    • https://pexevirojaloko.weebly.com/uploads/1/3/4/8/134882405/zonemamujunem.pdf
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/fejanuxabugajat.pdf
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/1739462.pdf
    • https://cdn.sqhk.co/gituridewo/5gjfc0y/becoming_a_teacher_at_40_uk_without_degree.pdf
    • https://cdn.sqhk.co/zebasama/bgj6Egf/5670671474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_59067651178946dd9e8250cef4180499.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d316ca9-1f2d-43cc-b222-7a3a6f6eb078/onan_generator_parts_store_near_me.pdf
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_b749768ae4de4a20bf0ce37cdb0c3f41.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2304a61b-8200-4ee9-bc95-7726b423bcea/wijegus.pdf
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_105ad2d2c62444c49dca5d2c35fbdca7.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_off0000e70b.bin
ddb4bc878f60c5ea9f90a837f30ec664ea0f44a1c1ef09ed5dfb7d9fc4ff0962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 5120 bytes
font_01_sfnt_off0000f885.bin
ea0d1aebba3067457ea144bd84b62ef0546b8e9dcc3c6401c631d9ba01aa0f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 11464 bytes

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