Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af75d472acb4571…

MALICIOUS

PDF

64.8 KB Created: 2021-02-22 05:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 48f8f20ef365661ff503ba18021f0449 SHA-1: 3451cc01a7a51009660993b8c2ffa9d584153a25 SHA-256: 2af75d472acb4571e5f7975c949e7bd6fa16632278367dc47eabab098509209f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=oster+bread+maker+5838+manual PDF link annotation
    • https://cdn.sqhk.co/sifilefu/3sVghP5/best_bingo_app_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/dhcgcRx/47808315458.pdfIn PDF document text
    • http://m-laskin.ru/bidavutujadolumepaze5ln2v.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/ghhgjaZ/72919148380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63b81733fc.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/xhdm5ag/35029695810.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/hjc64ii/royal_caribbean_international_uk_contact_number.pdfIn PDF document text
    • http://berkeciftci.net/girls_do_porn_episode_236ajqsd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6011d67431923.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/wisimonagoxunodatami.pdfIn PDF document text
    • http://tophomework.space/hakuoki_warriors_of_the_shinsengumi_iso_pspw2s3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5ffc21aeedf6a.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/c2ggigC/nojuxuxim.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/vezumobigodub/oxford_dictionary_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/35851958334.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/calibre_ebook_espaol_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/46903448086.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_off0000c0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F1 5684 bytes
SHA-256: 13101f5d8f90971103770c14e2918e54dc7dee7cb4dc59c84e9e85bffbb5f679
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 9936 bytes
SHA-256: 00b3f7000448a66a0d7f9c64222a431938e5502f01fa477e0876bd0e0022b27f

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