Malicious PDF — malware analysis report

Static analysis result for SHA-256 829a861480c9e2dd…

MALICIOUS

PDF

75.5 KB Created: 2020-12-26 09:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c3715f93a09b2bf1bbd18d9e084b6514 SHA-1: d701a79f3ae11e596c65baef332e6cb9738a7a6d SHA-256: 829a861480c9e2dd4153214de877e8263c384b9ffda4a4fb75bd1e56c5b7a520
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. This behavior is indicative of a link farm designed to distribute malicious content or engage in phishing. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=interlocked+hands+meaning In PDF document text
    • https://rebivawofud.weebly.com/uploads/1/3/4/3/134375894/nurajawifo-givopizisufumu-rolarejowubexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fd332d7147e1.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/2621446.pdfIn PDF document text
    • https://nubagusajol.weebly.com/uploads/1/3/4/2/134235051/bovuraforifaxigatemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fc38a6c4beab.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/8970268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_5fbe6ba2e558d.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/kezonezabam.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/zasikege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e9bb55-df55-4e1a-bdda-f16e2da7f45d/91663698691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca97dcc9-6de5-40e8-b8ed-da38e472a5a0/davidson_county_nc_property_tax_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b211757f-056e-40b2-9b37-1b83b38d32d2/49138533363.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 5356 bytes
SHA-256: 7049cedcc03482034fc87d6639a7803e1599f0263307e9d19c1630e990aad021
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 9808 bytes
SHA-256: 8d2b63f913f7571235014ff7e2d7380dbdc2b1e9634f2e780a6130bfbeed0c72

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