Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da895e51b07a8ac…

MALICIOUS

PDF

76.7 KB Created: 2021-03-21 23:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93412e02f6144f3d951b605b50ca250c SHA-1: 97d643b4a8ab77498756c5af4bb436e822efcf82 SHA-256: 2da895e51b07a8acdcb363aa0a6883bdfc90da1d290e04611781afc96f43cf0f
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=how+to+replace+bose+x+ear+cushions PDF link annotation
    • https://cdn.sqhk.co/fodumisux/hieftCb/11424802382.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/ginowitofi.pdfIn PDF document text
    • http://emmetrix.net/montgomery_ward_motorcyclenjlc0.pdfIn PDF document text
    • https://mulaxenowaw.weebly.com/uploads/1/3/4/8/134862071/6589977.pdfIn PDF document text
    • https://cdn.sqhk.co/fazologim/5XXjhge/jekaditemanepewiguki.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/IecQhfM/high_waisted_button_down_skirt.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/ji1ihid/sing_karaoke_by_smule.pdfIn PDF document text
    • http://wiregabjuk.fun/crosley_washer_user_manual089pr.pdfIn PDF document text
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/60f77a0e1.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/9aa63.pdfIn PDF document text
    • http://idealica-ituficiale.website/what_is_another_way_to_say_with_great_pleasureozn7m.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/kazinukud.pdfIn PDF document text
    • http://podarokinsta365.site/cabal_online_patchj6fhp.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/74949186681i8kv1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0b724b-3ea6-48fd-93b1-441f00fad6e0/83106940093.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_35aea7f26bf8402a849394ba46798392.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_6f3fa42ff0a34c23b070d60e7c18ce48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1605a420-cf16-4526-8c07-51502236687a/milewubiza.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_b6969d0817e6493799bdd6b9e55503ae.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_c0883006386b4791ac0c529daca9cdf9.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_443919efbb7d4fd9a1ba3bf90d7c4669.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_a66081a6964f48068626cc15d92a2655.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_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 5284 bytes
SHA-256: 2c688e6cf758eda38e0dfe16051666baae5e59aebb38e68c1c964382a6dbc7e2
font_01_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 11488 bytes
SHA-256: f68561a19d6e0006101727c61409d0526b3b14d70c2450f8089e58cecf476e90