Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ca779b38a52e71…

MALICIOUS

PDF

78.5 KB Created: 2021-02-19 22:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0d8b7ba07cca1ac0a5085e30be58d53 SHA-1: 36f4ed2c70d114c48a7d8220a5cb8efe1d3319b6 SHA-256: b5ca779b38a52e71963be2c4bf97665502b24572ed30263eeafee39230eace6e
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. It contains numerous embedded URLs pointing to various PDF files, suggesting a phishing or malware distribution attempt. The presence of external URIs and the link farm heuristic indicate an effort to redirect users to potentially harmful content.

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://jottigo.ru/wix?keyword=word+ladders+pdf+1-2 PDF link annotation
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/zolepipamosaj_zomedawogejawi_ziniruzojime.pdfIn PDF document text
    • http://kataeta.club/sipujasi7y1sa.pdfIn PDF document text
    • https://dizivabuzazelu.weebly.com/uploads/1/3/4/0/134017784/906805.pdfIn PDF document text
    • http://timecodes.net/badger_meter_pc100_manualrennj.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/c3hiflq/drill_down_excel_dashboard.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/19b47778804dab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380701/normal_5ffd5356b71c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380881/normal_5ffce1e1baed3.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/yvihvmG/how_to_cook_pork_chops_in_roaster_oven.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402297/normal_6006b9bcaea58.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/dIgejhX/leather_jacket_with_fur_inside.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/07b3286e4d19d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/vevosupi.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/below_is_the_information_needed.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/gigusamavukodawud.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_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 4816 bytes
SHA-256: b1d6ac825232710edfa0849c5433e2c4e2fb1c14a65627761cb1e89a77426368
font_01_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 10240 bytes
SHA-256: 24cdf5f41c17513dfdb362ca23e2e8ea02fce0dd2f7eba120a32881788c85547
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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