Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe8bd3785817d57…

MALICIOUS

PDF

80.8 KB Created: 2021-04-03 10:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c2cb1b257e4dd8fd1c326d83e732312 SHA-1: d493382b053cf9c2729a227220d171483f632a5a SHA-256: bfe8bd3785817d57d495abbbf15e68ffdc1ccbd09defa35f595e81ba19660422
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used to redirect users to malicious websites for phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to distribute links to other potentially malicious PDF files.

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://pelibifir.ru/strik?utm_term=what+i+learned+losing+a+million+dollars+pdf+free
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/xovadifajumetelot.pdf
    • https://static.s123-cdn-static.com/uploads/4454184/normal_600875f137f76.pdf
    • https://cdn-cms.f-static.net/uploads/4421783/normal_602ca980ebe3e.pdf
    • http://arenda-comp.space/faliresatu5rzcz.pdf
    • https://cdn-cms.f-static.net/uploads/4408343/normal_604982eaac45d.pdf
    • http://xasowokudat.medianewsonline.com/algebra_1_volume_2_answers.pdf
    • http://akvatehnika74.ru/whats_the_latest_dance_craze_2020z1bc1.pdf
    • https://cdn-cms.f-static.net/uploads/4449603/normal_600fb4c456403.pdf
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/dodenoxakuzolofiwovo.pdf
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5fd08bfe54b70.pdf
    • https://cdn-cms.f-static.net/uploads/4407084/normal_60579d8c1b089.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_604620d99c37c.pdf
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fe46e74391e0.pdf
    • http://viruxego.mygamesonline.org/dazogarexorexaluro.pdf
    • https://cdn-cms.f-static.net/uploads/4393349/normal_605e119bb4850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e504.bin
2860d14b473e697b04cdc0c1a611caf87aa5662486faf3505940b8441644c9fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 5468 bytes
font_01_sfnt_off0000f780.bin
1c50cb384570474fac9c137a3034f8f7cde1cefeca58d7691aacfc0727279c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 11852 bytes
font_02_sfnt_off00011fef.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16312 bytes

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