Malicious PDF — malware analysis report

Static analysis result for SHA-256 b050ba68acd0aa13…

MALICIOUS

PDF

79.4 KB Created: 2021-05-09 16:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71cec63efc191e9276ec5c4d01102e0e SHA-1: 16b54bf6d7c67eb578eeac375d7b627619e83da8 SHA-256: b050ba68acd0aa13b90c395413a9a9456fdd1139415f8114cd72bde97f019dc2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of embedded external links, with several pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of these links aligns with the 'Spearphishing Attachment' technique, and the PDF structure itself may leverage embedded JavaScript for exploitation.

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://mezovuduw.ru/strik?utm_term=the+righteous+mind+jonathan+haidt+epub
    • http://lianhua.life/benuk2y4rt.pdf
    • http://nexofozupugasi.mywebcommunity.org/zevapipiweruzipogoruzoj.pdf
    • http://gogadozuxigode.iblogger.org/89494190432.pdf
    • https://cdn-cms.f-static.net/uploads/4480745/normal_606a77c00d648.pdf
    • https://cdn-cms.f-static.net/uploads/4407314/normal_60611c6826a0b.pdf
    • https://cdn-cms.f-static.net/uploads/4379054/normal_600d86d923902.pdf
    • https://cdn-cms.f-static.net/uploads/4383574/normal_60111f7ab7033.pdf
    • https://cdn-cms.f-static.net/uploads/4473616/normal_6059dbbcbb700.pdf
    • https://cdn-cms.f-static.net/uploads/4498702/normal_600ad66ddf75f.pdf
    • https://cdn-cms.f-static.net/uploads/4373997/normal_602f8b68ade67.pdf
    • http://alternativeinfluencenetwork.net/ti-84_plus_calculator_charger26l8q.pdf
    • https://cdn-cms.f-static.net/uploads/4456122/normal_60175057e8d2e.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_602ec27aabec3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_9332abdad22e497ba12b1416e4ea9b9d.pdf?index=true
    • http://tirigofov.atwebpages.com/18685444269.pdf
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_29d78a72fb1640c4b0414d1f8556770d.pdf?index=true
    • http://baloxes.epizy.com/what_is_the_smallest_capital_city_in_canada.pdf
    • http://konezisuvalexer.epizy.com/mizoxil.pdf
    • http://nobidevapelata.rf.gd/73973643375.pdf
    • http://pusebirenox.myartsonline.com/vijopuxiputozanapekuruz.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_off0000f679.bin
8f7ce42056bf556e2e983eefcb2270bf2baf22f61f45d776eadc9468de0e05b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5508 bytes
font_01_sfnt_off000108ff.bin
4566b50a9e044f3b3d54f83d60a81bf26085400153ab31f1995838467dbedb31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10908 bytes

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