Malicious PDF — malware analysis report

Static analysis result for SHA-256 6891f61f6e9a3b6b…

MALICIOUS

PDF

93.9 KB Created: 2021-03-31 22:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2fa6a08817f49ffdb9b1076302198951 SHA-1: 915af405e8d26be66964f37ad57fcfcf0452aa52 SHA-256: 6891f61f6e9a3b6bd7b6c08e76b2aa7ea54fadf23d768a602ba26b7a4210f058
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 0.9997

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://crophysi.ru/wix?keyword=jab+jab+jab+right+hook+book+pdf PDF link annotation
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/15b826a9ce.pdfIn PDF document text
    • https://cdn.sqhk.co/vofudejobif/hjnhchd/draw_me_close_shane_and_shane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fe2875f9a6bc.pdfIn PDF document text
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/1224837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5ff2808575283.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/i9JQekK/wenosegemuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/igAghhi/make_homemade_bug_detector.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/QBigjgc/how_to_play_mexican_train_dominoes_with_hub.pdfIn PDF document text
    • https://vokavize.weebly.com/uploads/1/3/2/7/132710687/3082005.pdfIn PDF document text
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/3703644.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/hbgfKWM/background_for_samsung_a20s_in_nigeria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fd65b391e6cb.pdfIn PDF document text
    • https://dugepawegozil.weebly.com/uploads/1/3/1/6/131606694/genulipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_4fc96a404dd54a4a9e1149f0b9711c78.pdf?index=trueIn PDF document text
    • http://nudoritane.atwebpages.com/dutobogorekejuda.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_b18d613208f7400bb4a54d15c4fd9b23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/what_is_the_best_transducer_for_lowrance_carbon.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/90419107582.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/perugosisekod.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/28113313292.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 5364 bytes
SHA-256: 0e50270b16c1d97fc79bee60b08c4a918af83ae6799150a5f0dcb3696e4a0ed4
font_01_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 12944 bytes
SHA-256: ddf91ed7a0800d80979627d261329d9cab1f3470f94f65ae29704e0c4c3ac1b2
font_02_sfnt_off00015545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15545 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c