Malicious PDF — malware analysis report

Static analysis result for SHA-256 841bea3ac8e189c3…

MALICIOUS

PDF

76.9 KB Created: 2021-01-03 22:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eb97d067d2d41c54bdb644a4611adb6 SHA-1: d00c7345a7898c85d32d19c27c75d69021ec3b91 SHA-256: 841bea3ac8e189c38b6b9e97bb175cc7240eda142a836ff210eb9ed10699bb04
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. The document body's content, though heavily obfuscated, includes terms related to 'Harbor freight security camera app', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafficel.ru/123?utm_term=harbor+freight+security+camera+app
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/xapiw.pdf
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5f9c656d0e519.pdf
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f8bd1bd8f2cb.pdf
    • https://xiwitewikilimav.weebly.com/uploads/1/3/4/3/134371529/wunajakij.pdf
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5ff13cf1f021e.pdf
    • https://cdn-cms.f-static.net/uploads/4421224/normal_5fe826676cb2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purufiz/60921583290.pdf
    • https://uploads.strikinglycdn.com/files/8b7e95af-ce22-43f2-9a35-7cf896c9044c/luzuwoxonobuzinep.pdf
    • https://s3.amazonaws.com/poresi/15741570045.pdf
    • https://s3.amazonaws.com/gofiguj/71131695327.pdf
    • https://s3.amazonaws.com/zasepo/another_miss_oh_ost.pdf
    • https://uploads.strikinglycdn.com/files/a0d37b84-a536-4794-b4fc-fa6277c73ce9/50952287565.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01c.bin
979c18f2e7df2dae7356939870b449d22365dedd734688e7116ece961772520a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5600 bytes
font_01_sfnt_off00010308.bin
b6bd892c332cd99daba914ed7a5bbd5c33f965c97d397c36ce2798b10d9ce703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 10472 bytes

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