Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99c1b8c86d2ad39…

MALICIOUS

PDF

78.3 KB Created: 2021-05-25 14:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62335fd3c59a1924a001c4c981cf9e86 SHA-1: 6746c7b47845af0e3b64822285f2712cbb6b69e8 SHA-256: c99c1b8c86d2ad395e7aecbbdb5cd9371caf7f45e2297bf0ae2887e693d57e92
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing lure.

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 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://xezojetit.ru/strik?utm_term=6th+grade+common+core+math+worksheets+with+answer+key
    • https://cdn-cms.f-static.net/uploads/4466166/normal_5fdc1ae364321.pdf
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/3d72a.pdf
    • https://wibabuxef.weebly.com/uploads/1/3/1/3/131380054/4ef110a631.pdf
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/c9ab49c22fbe6f.pdf
    • https://cdn-cms.f-static.net/uploads/4366036/normal_60304299296a2.pdf
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fcd0dcc12149.pdf
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/gezowodagujo.pdf
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/7155503.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67e2c182-87e6-4fbf-a204-9b5bf5e7f812/the_painted_bird_netflix.pdf
    • https://s3.amazonaws.com/jivamubug/jutir.pdf
    • https://s3.amazonaws.com/xebuvuwov/how_long_does_it_take_to_read_jekyll_and_hyde.pdf
    • https://uploads.strikinglycdn.com/files/df437798-1883-4646-8173-f11e518e7d60/how_do_you_outline_a_marketing_plan.pdf
    • https://s3.amazonaws.com/setikizo/how_great_thou_art_lyrics_and_chords.pdf
    • https://s3.amazonaws.com/nitirew/pre_calc_book_mcgraw_hill.pdf
    • https://s3.amazonaws.com/wizidimawag/rau_kadambari.pdf
    • https://uploads.strikinglycdn.com/files/50626ff1-bd1c-4e63-83ed-d5fc6e2dd549/hisaye_yamamoto_seventeen_syllables.pdf
    • https://s3.amazonaws.com/kaxukok/monthly_planner_template_printable_2019.pdf
    • 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_off0000f3e3.bin
d3b0e6ade54ae3507545af7dd5b1387831f1682bead1fdefa0c228d819ab38a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5636 bytes
font_01_sfnt_off000106fc.bin
bdd1104fbbb137ef7557515ab9d0903b5ea1ec3e04af9a62cc3f980def077b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 10844 bytes

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