Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d4490dce846e20…

MALICIOUS

PDF

76.4 KB Created: 2021-05-11 02:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: df82142a79645b6052900d151bc990ba SHA-1: 36ac1d85b68b389b705d335e4e4cc5415c588f6c SHA-256: c2d4490dce846e2053fa83768204961044a255de6595014210d5b41d66540249
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly indicate that the primary purpose is to redirect users to potentially harmful websites.

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
  • 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://seumenha.ru/strik?utm_term=les+3+mousquetaires+film+acteurs PDF link annotation
    • http://muvisaxof.iblogger.org/how_does_popular_culture_diffuse.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/jgRO6hd/fojonunatanuvol.pdfIn PDF document text
    • http://paruvam.22web.org/43230032771.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/9d58d49.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/his5ghu/avengers_initiative_game_for_android_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/IChcnhd/wafusolezusupoxubadunarif.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/kufopumow-gudura-lidebivodu.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/fjaijqn/36069656129.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_a2577b24f3cd4144a74d1d591dc73676.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3de544-4e37-43b5-b93c-a5819da6c06c/11136363575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f017953-3f7f-40cc-b9b1-a98b19e99eef/from_superman_to_man_audiobook.pdfIn PDF document text
    • http://komujawabajufob.rf.gd/87088665354.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_acbedf316cca425f91e61d2014d1b03f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae495081-7ce6-4d7c-a328-82c6c52e517b/katulelibiwazobegave.pdfIn PDF document text
    • http://wejopapoxevore.epizy.com/87894593654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebc8dc0-47f9-4476-b5c0-205df69ed694/energy_soundbar_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cc2ad5-69ee-459d-94da-0223e3647a2d/zuzubikiget.pdfIn PDF document text
    • http://suxijiwuxupan.epizy.com/xipikokun.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_75dce3a52d7240baa4cbdca7c98154a3.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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 5256 bytes
SHA-256: ca3fccf436ceb80aa4f6f34c3d84e5458cc82b3f95a2f83df1a0b9d8782880fb
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 13216 bytes
SHA-256: 031a81536e8ca2aa139dcb804d3d83ba6c65fdc4102d095d0fb5f63832bfe05a