Malicious PDF — malware analysis report

Static analysis result for SHA-256 429ad9e031a7a490…

MALICIOUS

PDF

73.5 KB Created: 2021-04-09 03:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a58383f6f6253a324999ac1c3f5eb5d9 SHA-1: e98566532dc1e05ef544710e9780d66076bf10cd SHA-256: 429ad9e031a7a4901d7c01e531eda6934acb860a916908f2bb64071a942afd44
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to drive traffic to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://resalured.ru/strik?utm_term=msoe+transfer+reddit PDF link annotation
    • http://puxuwowu.iblogger.org/developmental_psychology_final_exam_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_600f3091cb89c.pdfIn PDF document text
    • http://fijigud.22web.org/temafusugadowulere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_5fdbc831b2a27.pdfIn PDF document text
    • http://spacexfoundation.net/beats_solo_pro_or_solo_37b9nw.pdfIn PDF document text
    • http://parexapubep.iblogger.org/exercises_for_total_knee_replacement.pdfIn PDF document text
    • http://groshyk.site/how_to_make_pizza_recipe_without_ovene5fgi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_1b75658123f54933a05cfc4836f476d1.pdf?index=trueIn PDF document text
    • http://lipegolujodik.epizy.com/ririnaxanosovogupukiwop.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_3143d524af7945a68c6c4dfbdaf33f69.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_c011e1a778a24242a2efc64224a97c68.pdf?index=trueIn PDF document text
    • http://baverasoge.epizy.com/85889735058.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_b5dbe683b41145c5b4ae69e4290052e2.pdf?index=trueIn PDF document text
    • http://nigagemi.rf.gd/awlgrip_topcoat.pdfIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_17f331877a134b23b5817622fb310b58.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_7e4ec450dbc04800883b8df6773467b8.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_c67084e51acf4efd92db71d8039b088e.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_446badef906243b2b6d261f842feb0b0.pdf?index=trueIn 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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 4872 bytes
SHA-256: 50196827c54bd550a0d83279689b78a66b7766e82a31c592369350f40152af3d
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 11124 bytes
SHA-256: 2ab00a3547dd478923ee47baec340b890b977507aaa03afb9b4337f350690bc0