Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb26e1d0449ffbd…

MALICIOUS

PDF

77.9 KB Created: 2021-05-25 03:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 45d1a380a5056f36763b5d393f3ed613 SHA-1: 2641a56ec3d9252a236465f8dc3dd78d03aadead SHA-256: fdb26e1d0449ffbdaec72f5cb18d68764d29269a13907d1cf126a489323812ff
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which are designed to appear as legitimate document downloads or search results. Several of these links, including the primary one, redirect to the known malicious domain 'yafferge.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • 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=bahria+town+phase+8+f2+plot+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_6041ff62511e7.pdfIn PDF document text
    • https://risegutu.weebly.com/uploads/1/3/4/2/134265716/zadusiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377647/normal_5fe1148555556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_6048203f861cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_605c201c562a2.pdfIn PDF document text
    • https://xopusetimova.weebly.com/uploads/1/3/4/1/134108877/3149584.pdfIn PDF document text
    • https://lopomibuliwipa.weebly.com/uploads/1/3/1/3/131381919/42b0a.pdfIn PDF document text
    • https://gavokafiwafez.weebly.com/uploads/1/3/1/3/131381231/675f822fd.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/6354532.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/7700971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_5ff14b4ee4ce8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fdfcaa26e18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_60677fe062c64.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/godogid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_602d08204ceb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_605eea643f937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_606b8ae3c8484.pdfIn PDF document text
    • https://nukarudurarera.weebly.com/uploads/1/3/1/3/131380042/boluzevususu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petubapizo/common_teacher_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1c9a30-a19a-41a5-b88e-e80ca01f94c2/html_css_bootstrap_responsive_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/anemia_y_embarazo_oms.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/21948782388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01cd5121-3600-4070-81b4-7fb47e8ba9d5/vefanotadorikekasipopas.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/sig_sauer_nightmare_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f4ebef-d83b-4dc6-be15-acfb4bbb83ca/ability_to_follow_instructions_interview_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e32cb18-92b7-43ab-89bb-6ed140bce18e/ap_lang_overrated_essay_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/taking_metformin_doses_too_close_together.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_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 5456 bytes
SHA-256: 3c869245a7eb9632f4f66f6674a71d115b8129b1478b7b7138d11f549b32cff0
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 11932 bytes
SHA-256: bff9bdd3f8567e0399c473e6b39d83c38a3e6b61ee9b48cbcdb0564b466e6ca1

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