Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fce4b5c70849a4…

MALICIOUS

PDF

68.2 KB Created: 2020-12-26 22:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2c850d6243459eeda6699723d922c6e SHA-1: 1f6e35367e4d14d6c2925cb59f02687955b3f96c SHA-256: 12fce4b5c70849a4cc4e42c2892b788ad4aaec3756f266ae33535ed53a8e2b7d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link farms, suggesting a SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=retro+style+refrigerator+with+ice+maker
    • https://cdn.sqhk.co/jafetegupam/8hgqCGD/grandpad_central_login.pdf
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/8e68d05aa7.pdf
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/xelaxofelap.pdf
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fc18bf645738.pdf
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f93ced5204ca.pdf
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/fudebag.pdf
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f8eb0cd5e1e4.pdf
    • https://cdn.sqhk.co/dofewijoras/c6khhiZ/neurologist_near_me_that_take_medicare.pdf
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/1628181.pdf
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/neravifanal.pdf
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fc1a10d81375.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_off0000cd9c.bin
325b1883e0e571b935141d648407efc854baaa6943e6ccd5c8f900ea403c7026		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 5560 bytes
font_01_sfnt_off0000e07f.bin
3cb496f91017fc5ac8c30e9d3fcc5b95355d2b1a82e9c8e894a236285565e16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 10488 bytes

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