Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf7e4b9914bc6e0…

MALICIOUS

PDF

77.6 KB Created: 2021-02-26 00:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 95f085d8dc79032ebc2119dd97b031d6 SHA-1: 303ce86a4b4a388734c4711a73b6058a31c9bf6f SHA-256: 5bf7e4b9914bc6e0c45af9d00fd65b3e0dd4f5b0f1e5aae16d0363ac3583db28
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=hp+elitebook+6930p+battery+not+charging`. Heuristics indicate this is a link farm on disposable hosting and a callback phishing lure, suggesting the document's purpose is to deceive users into clicking the link. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=hp+elitebook+6930p+battery+not+charging In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420235/normal_5fffffef3e3c1.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/PR7UUic/5856165890.pdfIn PDF document text
    • http://piredvizhnik.com/vomavadibokilojopetvlfz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_6031bb1c23870.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/gjjiids/fear_the_walking_dead_episode_1_free_online.pdfIn PDF document text
    • http://rutonujak.iblogger.org/seth_thomas_mantle_clock_repair_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_602d10ef35b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_5fd8548c82129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_5fd7904b6051e.pdfIn PDF document text
    • http://gijutudubesakuz.iblogger.org/lubufako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_6001e9facfe65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fd7eda192d2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bizaludewop.epizy.com/amplifi_tt_alternative.pdfIn PDF document text
    • http://sipopos.epizy.com/aadhaar_card_date_of_birth_correction_form.pdfIn PDF document text
    • http://jamanofubuvi.rf.gd/tabolarutegizog.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5900 bytes
SHA-256: 6fb38216303a65adc1ed5ee28dca03c157324fe7cfd76a84501543633677d750
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 10916 bytes
SHA-256: 05609307c8e65ee4341d85bb2af084c43802fc98e37a2375d710af14490e9038

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