Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de22104c3e80904…

MALICIOUS

PDF

66.7 KB Created: 2021-03-07 21:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 29b224d5dfa1d59ed607e7ef72bb5439 SHA-1: eb0938b65feda8df5968da44a7d9d6ab243fa07f SHA-256: 9de22104c3e80904a636b6acb5d18c31c324ffe32a194606ee67ba0125a175af
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'lozipotod.ru', likely serving as a lure for users seeking an 'interactive worksheet answer key'. The PDF's structure and the presence of multiple external URIs suggest it's designed to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/aws?utm_term=air+front+computer+interactive+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444864/normal_601a381faed28.pdfIn PDF document text
    • http://flathead.us/6661483929918k3h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_600fd3723735f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fd3ce2fd7bdf.pdfIn PDF document text
    • http://dimax-matrasy.ru/32303104985kkse4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fc7961b6b182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_603b6cbd462cb.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/xebimuvigeziwedm6f6.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/haulotte_compact_12_spec_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_c3f0482bb80b4e1281b839b61cf12202.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_c30d83809bc74108b4df97b69788e7ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sejakopa/are_all_milwaukee_m18_batteries_interchangeable.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_7d912e7815a042c38e81a699c6ea877a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/acer_s230hl_monitor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/felaborejevagave.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8b10e2fca3b04047a8af442c9a6662bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/assamese_movie_free_website.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/john_deere_110_parts_catalog.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_30feb533c6b342feb164eb7ce3f969c2.pdf?index=trueIn PDF document text
    • http://tuzufuwav.rf.gd/understanding_comics_the_invisible_art_review.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_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 5532 bytes
SHA-256: e629d187aad0f92350d159082d5909f19e13d94009451a791c7ff3f447875b9e
font_01_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 10240 bytes
SHA-256: 96a699db27bbcebf3c032889312a7696b94ca66acd152a615b42339203d5193c

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