Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0adc4f86b564e3…

MALICIOUS

PDF

67.5 KB Created: 2020-12-27 07:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: caabc724782378e0d4cefaa28c7d1209 SHA-1: 916135609ed7bda26b4efeba49007dcafdcb7866 SHA-256: 6b0adc4f86b564e3713157499a578eb87946af6c48395787d70de0c36239de29
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely used for initial access via spearphishing.

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=eso+reset+skills+while+researching PDF link annotation
    • https://dodotutole.weebly.com/uploads/1/3/4/7/134764587/luderodup_lesisobup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5fc7e91d6b812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f8d45428c57e.pdfIn PDF document text
    • https://bomikuwutivibi.weebly.com/uploads/1/3/4/5/134598741/5509420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_5f9e08b32d360.pdfIn PDF document text
    • https://rivatekat.weebly.com/uploads/1/3/4/6/134626126/4cf371.pdfIn PDF document text
    • https://nezumise.weebly.com/uploads/1/3/4/2/134265586/483604.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/6609806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/adobe_acrobat_pro_2017_student.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30629ff-c219-4486-a9f5-576cdac5405a/jubexaramuguvejep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea938aa-8809-48ed-a089-5ebfde21038f/18791061929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363a0d4c-c467-46c8-b522-b97cfe56200f/the_fisherman_and_the_jinni_theme.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 5172 bytes
SHA-256: fb69fcbaf4511b25ca93a96a7a67f083dce68d06056a491868c753ffbe8ed417
font_01_sfnt_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 10876 bytes
SHA-256: f539d723228c8b82580e275e3a3053f990723b8e85982080c5a40bca4cc076d0

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