Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3adb94ac624da0…

MALICIOUS

PDF

80.6 KB Created: 2021-05-30 19:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2dc78dbcd98c0e48f9011359855602d SHA-1: 793876098c69e310c9bb13fcb9bad1b2692c34d4 SHA-256: 0f3adb94ac624da085ca3a54902262f4bb02499090d28bd49ec7404c88be934f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=what+is+a+comparative+adverb+example
    • https://cdn-cms.f-static.net/uploads/4492586/normal_606c9f450b0a9.pdf
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/306d49c88.pdf
    • https://vikaworapelesob.weebly.com/uploads/1/3/4/7/134702945/muvutojegujaw-salupobun-rofubobu.pdf
    • https://gumopaxegekugod.weebly.com/uploads/1/3/4/0/134018731/a6a3fd.pdf
    • https://nawezuto.weebly.com/uploads/1/3/4/5/134595998/xekamine_nanofixodomer_ramisepufipaf.pdf
    • https://cdn-cms.f-static.net/uploads/4481403/normal_6023e22549bf7.pdf
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/4138500.pdf
    • https://mesedegusi.weebly.com/uploads/1/3/4/6/134600151/6368942.pdf
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/vasinikasu-sefanumi.pdf
    • https://cdn-cms.f-static.net/uploads/4450424/normal_6042cdd5ddda9.pdf
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/afc6bf.pdf
    • https://lumikefobebodas.weebly.com/uploads/1/3/4/3/134324067/8664844.pdf
    • https://damafurota.weebly.com/uploads/1/3/5/3/135337485/vudonuso.pdf
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/62b32451021510b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1bdfa9de-5b9b-4f8c-92f0-caaf555ee226/can_you_change_bands_on_apple_watch_3.pdf
    • https://uploads.strikinglycdn.com/files/025c6353-f342-4749-a6a4-f8dd6819348e/85042361967.pdf
    • https://uploads.strikinglycdn.com/files/d3f18954-8fcb-4ac0-afd1-9a4da10376cb/persona_4_golden_guide_reddit.pdf
    • https://uploads.strikinglycdn.com/files/673a5f1c-2187-4205-bd1f-2c097260e327/pride_and_prejudice_bbc_watch_free_online.pdf
    • https://uploads.strikinglycdn.com/files/b34afe1d-825b-4410-8dae-4d5b696752c3/49755521352.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19c.bin
4c32ca2b680e3f7897140da8ac9b83e3a5c15fb6e2ea1ecbc3e7f91ce9ee81c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5596 bytes
font_01_sfnt_off0000f47d.bin
bea7d956912904322f048ca6be933bd34a0d7c56e61eca0fef47e9d2f06e9923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 12484 bytes
font_02_sfnt_off00011d5a.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16312 bytes

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