Malicious PDF — malware analysis report

Static analysis result for SHA-256 967ada3505c9403d…

MALICIOUS

PDF

84.9 KB Created: 2021-04-21 14:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a800c3b812f484a2de02d051c1233887 SHA-1: 90457bc47e40b1eeafd558408c688c0e74f77341 SHA-256: 967ada3505c9403d1f199def2c78e25d03c2d902714485ec10d13ad2b3471256
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on 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 malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=five+nights+at+freddy%2527s+3+free+gameplay PDF link annotation
    • http://zakewabo.scienceontheweb.net/carcinoma_basocelular_tratamiento.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5fda7be6b7cf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fecbb3dafb1f.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/2735548.pdfIn PDF document text
    • https://xawoveramexu.weebly.com/uploads/1/3/4/0/134095940/656174.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/fotogivawos-wesiwixu-pitibumug.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/bh6ygc8/my_home_design_luxury_interior_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd91f8ba7dce.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/nopekomepodevekudoxavag.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/feluzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fea4174e0d9d.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/nagikij.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/ichMkpc/64136104830.pdfIn PDF document text
    • https://zovalimifo.weebly.com/uploads/1/3/4/7/134728177/f37b58cc551734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/06f54144-ebc5-4815-81d6-c9538273ed26/79110064232.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_db38c9cb638b41c9931bc2e85dfc48c8.pdf?index=trueIn PDF document text
    • http://zewadomi.myartsonline.com/variable_frequency_drive_working_principle.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_c65478d47d034b86a02881a9ae39efbf.pdf?index=trueIn PDF document text
    • http://tipipigi.atwebpages.com/taruga.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_0534f89648cd480bb1e7bab5505112da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d28ecc-d187-4da7-9543-9ec657230762/sorofosejumawu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 5448 bytes
SHA-256: 3b2c38c2f1f4309d74cb602010f779f24015444b48232595249f0a70f182b9e1
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 22424 bytes
SHA-256: 634c5d8c8f1c88ba8d1e18897befe09ae1bab4172b66c91d118cd76358e6d0a7
font_02_sfnt_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c