Malicious PDF — malware analysis report

Static analysis result for SHA-256 011b26b517c1150b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-22 02:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bcaa42a621ccce70d0bb3d7607c09203 SHA-1: 74fe7c84fabf212c298d4a35ae4910c845fc0f48 SHA-256: 011b26b517c1150bed6ed421a330f2a487a6739848be73e3052e2ff3a017b216
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 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

  • 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://bologen.ru/strik?utm_term=bosch+ts3000+review PDF link annotation
    • http://vojemodipu.sportsontheweb.net/66480015601.pdfIn PDF document text
    • https://rosunitekuw.weebly.com/uploads/1/3/1/3/131384708/e7a54693f.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/KgddNzM/napipesadobene.pdfIn PDF document text
    • https://cdn.sqhk.co/zowajomi/bhbEzgL/37900176860.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/d6XSdVZ/subway_princess_runner_play_free.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/jhCrkjc/brain_uploading_machine.pdfIn PDF document text
    • https://gutakabumediru.weebly.com/uploads/1/3/4/4/134492877/eb5d9cd95c.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/jitTSjh/voicemod_android_apk_mediaf_re.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/4266142.pdfIn PDF document text
    • http://lixusopo.mywebcommunity.org/shintoismo_dioses.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/catsa_act.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/kjg60gd/magipawebelofupunimev.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
    • http://rixuroruwe.myartsonline.com/75028014769.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/gapixigilelujovipadolufej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21392594-2edf-4980-a97f-e8a957bf45cd/troy_bilt_lawn_mower_bagger_attachment.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/dojabevo.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/acetic_acid_bacteria_fundamentals_and_food_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5baafc-3905-4d95-b04b-ab2af8fe562d/9669275056.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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 4832 bytes
SHA-256: f2548658c8269632f2f1b9a3fd2ba1a1812e45012e2c47c9c79fc3d94a948e42
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 10888 bytes
SHA-256: ce5267e9775027aebe1787e630eb37475e077272d5c32ab85b4bbd3af7d4eedd
font_02_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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