Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64d4795b593fb05…

MALICIOUS

PDF

73.3 KB Created: 2021-02-19 13:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 19278bb0159ef73ffdc90b6a6b837cbc SHA-1: dfdea173ac9782924924e98bead04bfbf2f309ab SHA-256: d64d4795b593fb050bca523dd26ef4c8fa14ab1b03d4481b47796c2bcbcc6606
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and the nature of the link farm suggest it's intended to lure users to malicious content or exploit vulnerabilities.

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://leonvi.ru/strik?utm_term=acid+vs+base+food+chart PDF link annotation
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/zatoxukep-lotozo-dusalatukuv-rekim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_60204d58d9d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fd388bf773de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5febbf2d4fff9.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/mewonunolilotar_rutotelupix_nomili_gifuraliwazono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fe81902cca00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5feb1b3b5efc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_602520b63e933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5fc593739e5e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_600ffacfe2f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_6007d89d1f065.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/fegusapunedapix-lazelifa-dekovi-xexafilatum.pdfIn PDF document text
    • https://jetijejage.weebly.com/uploads/1/3/4/3/134319548/b447ea11e4d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5fda6b34341d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_601d945034712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jagakemiwowinig.epizy.com/formal_way_of_asking_for_assistance.pdfIn PDF document text
    • http://tebuwibuweni.rf.gd/minecraft_pc_tlauncher.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/wajugedirobap.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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 5264 bytes
SHA-256: 894c8a4a89f910f1b7debd1c7870d5fc69817fbe606e6e8fd672b51854c3d05e
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10204 bytes
SHA-256: 159c63318b6d32342a2ad4f34db6bd56b2ad55db43f281c744cbdf65a9ad185c

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