Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a999c6288babe64…

MALICIOUS

PDF

72.3 KB Created: 2021-06-12 14:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2411f70f5697b5460358f8fdfde29c7f SHA-1: 97fb1c9a3f91e43094d89c6974e5f4e1e691200f SHA-256: 3a999c6288babe6454022aed51dbe5cc6a27193ec0e9aed9f81cedbbd65a3086
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/pbw?utm_term=rules+of+changing+active+to+passive+voice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5fdb63f8cc4e4.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/8039393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_60c41bd8ee82f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448331/normal_606ae1c1900b7.pdfIn PDF document text
    • https://somejokal.weebly.com/uploads/1/3/4/4/134494219/9744511.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/wibimevamupofosevuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_601fc3f1c86f7.pdfIn PDF document text
    • https://fonixokud.weebly.com/uploads/1/3/5/4/135400654/jexixivat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5fceefb95a408.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojipag.pbworks.com/f/34306539179.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144590958/xavifimetek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0ed14c-c440-4a52-9030-e5785296b4c1/what_is_comparative_study_design.pdfIn PDF document text
    • http://wipadewor.pbworks.com/f/dokupebapeberijikuwev.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/10476615948.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/progetto_genoma_umano_zanichelli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee46940-8d90-40ce-ac45-5a11844f8b40/pakujujasafevogosotusope.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/f/segujedotakabeponusow.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144469161/binuxafoladazomepube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc39726-81b9-4823-926f-145f3d34b271/2008_dodge_avenger_issues.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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 5248 bytes
SHA-256: 1864cd9b3295df2136fc873a9a137036925fc1a36f11ea66be67783596d2a7f8
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10448 bytes
SHA-256: e5f587ffa04a19083657f960d64f8597c5904720088d8797ca5152ad00010b56

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