Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4d27275e0bd3ab…

MALICIOUS

PDF

69.6 KB Created: 2020-12-16 11:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 681e8462dce46ef852888174104a8d40 SHA-1: 7080a1a19e89321842a238f1cb573fda6c65709a SHA-256: fd4d27275e0bd3ab989084fa6e998a5ddb62c9bd93e23bc64128a4564cf2f316
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to 'cse 2020 exam date', which is likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://traffset.ru/123?utm_term=cse+2020+exam+date PDF link annotation
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/fozebexab.pdfIn PDF document text
    • https://posoxoniboje.weebly.com/uploads/1/3/4/7/134713430/dibusawuvalumiwiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8f97c7aa415.pdfIn PDF document text
    • https://sibemawiwojaro.weebly.com/uploads/1/3/4/8/134887292/rataw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_5fad2b3a3c281.pdfIn PDF document text
    • https://votumojelobi.weebly.com/uploads/1/3/4/8/134848055/88b5e382fc.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/xugewutexix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501046/normal_5fcf6e2a67309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_5fb7b92f17008.pdfIn PDF document text
    • https://bolowarokarov.weebly.com/uploads/1/3/4/3/134349384/3063922.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/928ef7e.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/5fc38ae5bdb33045eed2d05a/t/5fcff2e78a12e71c19ca3883/1607463655759/best_playbook_for_run_and_shoot_offense.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe06703485235c868c2725/1606289009406/cat_in_the_cradle_lyrics_cat_stevens.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55ba5239b0722914ef72f/t/5fc854c27ff5a343ebf1efc3/1606964418283/wedding_cake_decorating_ideas_videos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 5092 bytes
SHA-256: 45b2cd309bae0261531c926de36ff7e1d506e6e3c8f1f9a533ceaa27efed4157
font_01_sfnt_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 1936 bytes
SHA-256: 73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190
font_02_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 11076 bytes
SHA-256: 356451d5dfd4ce107ef08d60f6fc670e97e521c7951b2e3f2c2b62d305d30346

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