Malicious PDF — malware analysis report

Static analysis result for SHA-256 075167938445c0bf…

MALICIOUS

PDF

72.2 KB Created: 2021-02-18 04:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e75a83d778ccd3e11fea17e617f862d6 SHA-1: e41820d99532f0e847befd12bc47026c3e43baf5 SHA-256: 075167938445c0bfa05a31b383003c41f864fee9ff3e1328a36119d30a3f707e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to further malicious content or exploits. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+is+the+largest+species+of+praying+mantis In PDF document text
    • https://cdn.sqhk.co/lamikolo/bKvsjjt/pomegosetego.pdfIn PDF document text
    • http://axecheat7.xyz/47623826823g889q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5ffb2ff0107f7.pdfIn PDF document text
    • https://cdn.sqhk.co/mojaribi/OiheyOv/wrestling_revolution_2d_wwe_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fd3888d83b81.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/gDgiJgK/26964595156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff366b99ee11.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/fipozubebaxevuzixowemukaajjpd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5ff2e503cd14e.pdfIn PDF document text
    • http://help-ruleviolation.com/13041567229n9lg7.pdfIn PDF document text
    • http://fullcreditreport.info/35628212079wj13b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fe6517877187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vanomuwoz.epizy.com/ccrpi_calculation_guide_2019.pdfIn PDF document text
    • http://resaruxowepu.epizy.com/58766325738.pdfIn PDF document text
    • http://dimaninerif.rf.gd/zutokowagegekekixar.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/module_2_test_review_answers_math.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 5544 bytes
SHA-256: cb9f91ecd50da9bc9178f2500fa4211f6f63be99bab64f344825f22546585185
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10340 bytes
SHA-256: e66f84014a9975017a484366fcf7506917f220aff1b29822978a9b6d7d443784

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