Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb15d0a40c1e2866…

MALICIOUS

PDF

67.7 KB Created: 2021-05-27 10:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8941266a0840338cecdaf616f271710d SHA-1: 754e3fd2065c7b8be0239380913d55e8e9cbbd38 SHA-256: fb15d0a40c1e2866079b0e555187b36289d02f8b3a6d343a7cc0ab8b189f8a29
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, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=jetpack+joyride+theme+midi
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/gudexexet.pdf
    • https://fobimagav.weebly.com/uploads/1/3/4/2/134235660/kifelizijazoz.pdf
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/3605663.pdf
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/9224237.pdf
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/c6756.pdf
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/28cc1e445cd5d.pdf
    • https://xusudunegowubub.weebly.com/uploads/1/3/0/7/130739081/walevale.pdf
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/zosajumufo-jewupaned.pdf
    • https://getazepamotiga.weebly.com/uploads/1/3/4/3/134352900/5195667.pdf
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/rodenol.pdf
    • https://cdn-cms.f-static.net/uploads/4459481/normal_5fda4654d88a2.pdf
    • https://cdn-cms.f-static.net/uploads/4487419/normal_5fd8322fbcd08.pdf
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/fibatamukuluv.pdf
    • https://cdn-cms.f-static.net/uploads/4421350/normal_6015603e962e1.pdf
    • https://cdn-cms.f-static.net/uploads/4483837/normal_5fd7957cbde45.pdf
    • https://geselumagema.weebly.com/uploads/1/3/4/6/134695037/jaralolufem_fidujitenisapub_mojus_fejofok.pdf
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/jixokedixanop-pupedezorifer-muzemomasax.pdf
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/02900a.pdf
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/pazogizes-rureko-ziduv-xokeja.pdf
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/vorixil.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc94.bin
e9c9372384dd8a1bd92b46607481d5754b1f0084b54245a1ef3ac1d30357269c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 5336 bytes
font_01_sfnt_off0000dea0.bin
1498c7e613e294c44ed46d5d14face069f961aa5749fd4320ee3719b96d6ac96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10208 bytes

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