Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d03280135a849b3…

MALICIOUS

PDF

75.6 KB Created: 2021-04-19 02:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ad30588f37dc4c3502696d280e1a060 SHA-1: 568961fb4d75fd367ffd34675f4bab0781914842 SHA-256: 2d03280135a849b30b489f1ac2956a283313b4412895ae580eff2c2fb0c62c12
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9991

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://midufefew.ru/strik?utm_term=gliffy+tool+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5fffd51ea2f8c.pdfIn PDF document text
    • http://50offshop.info/35149023977k50e7.pdfIn PDF document text
    • http://moekolechko.icu/665668366465u2zr.pdfIn PDF document text
    • http://mixikoxuve.22web.org/midemiwamu.pdfIn PDF document text
    • http://agentsecure.space/what_are_the_characteristics_of_liberalism_brainlyjtnx9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fd6aed60677d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_601ba9fa146ef.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/7239019.pdfIn PDF document text
    • http://tradestaroffice.com/56028576871269rb.pdfIn PDF document text
    • https://gusupaserilobe.weebly.com/uploads/1/3/5/3/135312632/visitelorobu-wupevo.pdfIn PDF document text
    • https://tegimawemax.weebly.com/uploads/1/3/1/3/131383609/pexogaborizubabo.pdfIn PDF document text
    • http://jagefefixod.22web.org/gaming_pc_build_guide_under_600.pdfIn PDF document text
    • http://ideaita.fun/143328104291s2h9.pdfIn PDF document text
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/dozosagoposad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/15084962140.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/android_tv_box_ir_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e92f70-1dd7-43f8-8cf9-f22d6b94470b/why_are_animal_studies_important.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/cardiovascular_system_anatomy_notes.pdfIn PDF document text
    • http://didejanumaxunef.rf.gd/91229955936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d486f282-37d2-4ad1-a38e-beb28707899b/ge_telephone_answering_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/pegiwinuvadurovapebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2f8feb-bb61-4ebc-813b-798d1a86754f/miwatomu.pdfIn PDF document text
    • http://nisajemisekim.rf.gd/the_analysis_of_biological_data_michael_whitlock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d097113c-21e9-48c2-aa9a-045b110c6df2/vamirif.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_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 4948 bytes
SHA-256: 3b2ad2d4c9b5f8f671d225cb5f08a138cc1b0a5883b2753af29f9305b0625d4b
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 11100 bytes
SHA-256: 4a43ac5fdb3e2c378252283b2b010e366c82421386251ed7919294af6a08180b

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