Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a9794cfd43840f…

MALICIOUS

PDF

80.6 KB Created: 2021-04-06 16:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa30fe2a479f29a8ed9cd1ae6ab95e56 SHA-1: 7959a080fe0bd10571ab0e047a235fdc4cce0279 SHA-256: 24a9794cfd43840f4960dc47a060597fddb145b279043acc5a77fc11d11aaa22
196 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to suspicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SUSPICIOUS_LINK_LURE' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, disguised under a seemingly innocuous document title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/123?utm_term=self+guided+tour+hoi+an+old+town
    • http://werenntaq.online/vogoxixuxikitajaxunuzazw0vsw.pdf
    • http://dompodklyuch.com/introducing_interval_notation_worksheet_answersplll2.pdf
    • http://get3creditscores.info/how_to_code_a_simple_video_game9lj7h.pdf
    • http://karnaval.host/sadodameminewoj7g8m.pdf
    • http://golden-bridge.pro/4868416264a3wkd.pdf
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/9513220.pdf
    • http://karnaval.host/score_hero_529aris8.pdf
    • http://azakalaza3.xyz/asus_maximus_viii_hero_z170_specsu54pg.pdf
    • http://ru-en.xyz/best_app_to_learn_kung_fuus5uh.pdf
    • http://managerprogram.live/83627516501v6khl.pdf
    • https://tubababekegoso.weebly.com/uploads/1/3/4/8/134880125/raxadiz.pdf
    • http://magicwoolshop.com/956919120493553k.pdf
    • https://bufigolumixi.weebly.com/uploads/1/3/4/2/134234787/molejaru.pdf
    • http://coolmag.biz/biblia_poznaska_chomikujp2i11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/48a13293-6c72-4eb3-912c-0dbd900a6f92/r_programming_language_download.pdf
    • https://uploads.strikinglycdn.com/files/0fc126ac-bcf6-477e-9c17-61bff7f701de/canon_430ex_ii_shoe_mount_flash.pdf
    • https://uploads.strikinglycdn.com/files/857830dc-2669-47a4-b7f2-3e551f541174/sample_letter_of_intent_for_commercial_real_estate_purchase.pdf
    • https://uploads.strikinglycdn.com/files/25f2c9fb-3300-4b1f-99f8-9649ea9cf9dc/wewetumaja.pdf
    • https://uploads.strikinglycdn.com/files/c59b4bdb-0f73-4241-8e35-6efaee17b4ec/how_to_get_married_in_court_in_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/b11df6d4-640c-4b6d-84ef-3ee7a894a283/jodimixizodawesutodo.pdf
    • https://uploads.strikinglycdn.com/files/22ce95c7-f583-4c3c-8e0f-3d13286e6314/zajepimex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa77.bin
89d2508896200347c4f75f61830f925b7d61ec9fdb5fd8b07a787cddcdd326af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 5188 bytes
font_01_sfnt_off00010c29.bin
dcb12b37afce479dd84ea3360de4af9848c7b15cea184aaabf15ca5cf1db3bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 13340 bytes

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