Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f1b979863144c5…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 01:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac216552e2dabba9f743731f837dc3a9 SHA-1: 11c7c46fadab7db7a3130a286d7a68fff23edcbd SHA-256: 98f1b979863144c5612bcb9765d7d4b8d78126baa0015c85fa658ce9a398ac59
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=bombay+velvet+full+movie++mp4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406168/normal_600b743ed1eb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5feb3b9a5d7a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fee88a94c67a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5fc60c9735d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5fe7a99bddf2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_602811642de81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fdc0fd8aa15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_602d95671a1b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_601712cf05683.pdfIn PDF document text
    • http://pedrons.space/what_is_the_remote_code_for_tcl_tvqxli0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fd3a2896b22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_600aff0f11671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_60468319e9ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_600f578bb4028.pdfIn PDF document text
    • http://nilutafejo.mypressonline.com/ballade_pour_adeline_piano_easy.pdfIn PDF document text
    • http://edaeda.moscow/581834749114rk87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavapokapajemob.myartsonline.com/low_carb_food_chart.pdfIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_4327a94b246047b5912cf1f2da939832.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_816657ab77484ab3aaf3f3026ade55f2.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_95a06be350454982b18f3c6c7f457b44.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_154917b223444ef7ba74957244a4e740.pdf?index=trueIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/advanced_english_grammar_class_7.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5212 bytes
SHA-256: c87cfdf2f03dea76a2d941ee7f9f91fad780bf681fb67612f9c36fdedb678942
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 11776 bytes
SHA-256: e780be4e44536648acee52112fa9e72a7f03a4b5c54d142c91d2b076f4fee5eb