Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a53670f6703c24…

MALICIOUS

PDF

67.2 KB Created: 2021-01-05 08:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 29c6b71021487440bd03ee7a3f813c25 SHA-1: bbba8602308391d935706025215859a5177f68da SHA-256: f4a53670f6703c24a36d2e956d2bc8e835bcc8946c353e65a341b70645ffebd8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=ending+punctuation+worksheets+for+grade+2+pdf PDF link annotation
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/2254314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_5fb4c226dae75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5fbf15ef82a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f93b99301f0c.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/3cfd05c7.pdfIn PDF document text
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/2573845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_5fab136b3ce5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f86f60df3aca.pdfIn PDF document text
    • https://mafopobivo.weebly.com/uploads/1/3/4/3/134322173/lakafajo.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/ropetud_mewisoxekiwuve_varav_gewujatimebamaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/XIFVF3H/old_tomb_palace_escape_walkthrough_part_2.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/96d4be.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/xarojapi/vitality_health_nail_fungus.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/bottle_rocket_science_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/best_android_tablet_deals.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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 5512 bytes
SHA-256: b7c133bd2c70a4a91caebae0a59ada3626e62be233c81c5f6fa937287a6bc142
font_01_sfnt_off0000ce51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE51 10408 bytes
SHA-256: ac71cadac8ac4ec74d552e60afaca266e860dd40f61d979aa7e0d5ca8364ba22
font_02_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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