Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a2f1dc70926aee…

MALICIOUS

PDF

79.3 KB Created: 2020-12-19 07:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 13cb190e0d0d63a3af216c04ba05cc96 SHA-1: 224df938f8ad164027deecbea96368a3116950b8 SHA-256: f7a2f1dc70926aee144be99b8c28d07e34824e6eca22117ece26c8d2861ef079
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/strik?utm_term=sous+vide+poached+eggs+anova PDF link annotation
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/7644425.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/4fe6e72f703ac7.pdfIn PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/d492295826e.pdfIn PDF document text
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/kojonolowadoso_devomu_jofip_dubanapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464319/normal_5fac38b876cc5.pdfIn PDF document text
    • https://zuxubemusaf.weebly.com/uploads/1/3/1/4/131453996/4d72d95ad271.pdfIn PDF document text
    • https://magozenidudib.weebly.com/uploads/1/3/4/7/134711122/dozesenedu.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/e10e985c14d0.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/wizufezirup.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/fcfddfbaf29.pdfIn PDF document text
    • https://lipitedo.weebly.com/uploads/1/3/4/3/134380968/2845024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f87d6400abb2.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/muzanirufug.pdfIn PDF document text
    • https://tuzatorigipixaz.weebly.com/uploads/1/3/4/3/134321964/rasunewugexok.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/9953594.pdfIn PDF document text
    • https://gogakasepasepun.weebly.com/uploads/1/3/4/3/134375341/dugopeweposa-xigegovozeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60cd5fac-c228-448b-9b5e-523c7c0660b7/pricing_strategies_marketing.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 5372 bytes
SHA-256: 729a34ac2a1950258247e4b5a23bc9cecb9a7ccd0f34cf993fbffbd5d0a1a0ab
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10796 bytes
SHA-256: 8b9fc9057af388d449d8f44546ab5cd928fbd7d8801e2f4805f6608d4c79d302
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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