Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac65c2485c02092…

MALICIOUS

PDF

88.7 KB Created: 2021-04-05 02:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1e4d850df132d74c606f35a8ce0284d SHA-1: c926659941a1985480eb30c9b3adda8c0a08d06f SHA-256: 7ac65c2485c02092c2ffbcd949a2944f917198451829e353a0ed74d6fd1020a3
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs designed to redirect users to external sites. One of these URLs, 'https://yafferge.ru/strik?utm_term=best+photography+books+2020+uk', is flagged as a malicious redirector, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=best+photography+books+2020+uk In PDF document text
    • http://zugamumenune.22web.org/vewebetit.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/Xghc9hd/dragon_and_snake_compatibility_business.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_6020a7c051cd1.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/gcNbsja/lelijowuxonasuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_602b9471a3490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473654/normal_5fcf585f3d75d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460042/normal_5fcd7cf6dd072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_603e6cd4b0fbb.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/jetSc6V/77882584946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_6021ecf86be7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_60400501e65d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_6008c60631dd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_6764797f53ee4a5f8c1bf9adade3bdc7.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_98495b5f1b66482290a4d64cbfca751b.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_3a9ecce0ab4e41ff80ee5d3be82d0851.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_7ee250a974e44fa291dc96e3ab1064c4.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_6c8723a1e37d41c9b9082494224a64d5.pdf?index=trueIn PDF document text
    • http://mebolunene.rf.gd/lofarilisarutab.pdfIn PDF document text
    • http://mibofive.epizy.com/48354937302.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_ff65d6ec069e439d8ef41ae95bc3d762.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_2943b26d229745f692838b2335d793cb.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_110c7f546b5c49f5b7e9022eb647dee4.pdf?index=trueIn PDF document text
    • http://jewuvebasabam.rf.gd/crossfit_level_1_training_guide_hard_copy.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000139ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139EC 17260 bytes
SHA-256: 8012a115beb57871694266f4204a336a4a67e11c0dcfa7b8fd403be144db3e7a
font_00_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 5676 bytes
SHA-256: 53b57b1d1f17212269175f28624b0af693434b77e4d3cee291142a95125fc5d8
font_01_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 11468 bytes
SHA-256: 74b15d612dcde06ed2fbf8dd3d5506a3eff00eddc25d79364ee1ec88089aed58