Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e0b92abc607025…

MALICIOUS

PDF

61.0 KB Created: 2020-12-04 05:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5a4def2c465946385d3ede13acb8f4f1 SHA-1: d56c4d6123bb30728f436c6dda0aa5cac4378605 SHA-256: b9e0b92abc6070256f47db586e39dab047a13681c4b6e3d35cbd45ba533c6e0d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded external links, with a critical heuristic firing for a "PDF_SEO_LINK_FARM". One of the primary URLs, "https://trafftec.ru/strik?utm_term=ga+110+manual", is likely a phishing or malware distribution endpoint. The document body, though heavily obfuscated, suggests a lure related to a "Ga 110 manual", and the file type and heuristic firings strongly indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://trafftec.ru/strik?utm_term=ga+110+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5f8d3ec4f2a45.pdfIn PDF document text
    • https://jaxobowes.weebly.com/uploads/1/3/4/5/134591409/bajoloxuj.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/lewuli/cessna_210_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c6a030-77ff-41a5-8ca2-f44460f5f59b/ninagurikajejoravat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe164d18e72e5fdb9ee876/1606293072962/combining_simple_sentences_into_complex_sentences_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e7a8d7-f6d4-4c25-bceb-df3699d28837/90588286506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d156e864-47ab-42de-b927-02264b59a578/dolevikimodemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ed327c-2f8b-42c4-bd3e-e48318ce0bd4/ib_chemistry_past_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51dc46c-815f-40ae-b700-45177f6a843b/5064342975.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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 4780 bytes
SHA-256: b87317d6ba233db9dd76f02da8e8e8a7a156608553a22d0afe87ab276df9d353
font_01_sfnt_off0000c54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54B 9712 bytes
SHA-256: 4671db6cc7a85a63700605e0c11391c393aed116203b564e4124bd3bd4e301b7

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