Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24048e279bbc9a3…

MALICIOUS

PDF

76.2 KB Created: 2021-02-25 10:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: debca99ef9b7954d523e1b987dc00c85 SHA-1: 5da7b10a1cbc9e2c0af3b9aee3f4ade602cb3349 SHA-256: a24048e279bbc9a3ac6a3950fa6fd3583f82a5a13374fb72f093685f65042ca6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as linking to known malicious redirector infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable domains, suggesting a coordinated effort for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=kenmore+stackable+washer+and+dryer+front+load In PDF document text
    • http://itwomen.space/bee_brilliant_blast2veqw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471959/normal_5fddce522560d.pdfIn PDF document text
    • https://cdn.sqhk.co/jorubili/fieshhf/zoxudabamipopuvurux.pdfIn PDF document text
    • http://therarbooks.com/88294891981r03w6.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/dhicqU8/wakararaxo.pdfIn PDF document text
    • http://desokore.medianewsonline.com/sketchbook_brushes_free_download.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/sukasigijeroligulopaw.pdfIn PDF document text
    • http://ecoterritory.store/my_hero_academia_movie_character_list4e2m4.pdfIn PDF document text
    • http://milanomoda-italy.website/mekuxiwuvejugikofkqsy7.pdfIn PDF document text
    • http://wordwild-store.com/curso_de_ingls_intermedio7li73.pdfIn PDF document text
    • http://apsmall.space/ringtones_free_for_android_mobile_phonestwy3l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_5fce82f53402d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5fe8441d5dab0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415768/normal_600329d171a67.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/83185376707.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/49539346240.pdfIn PDF document text
    • http://bluhgang.best/what_are_circuit_symbols_used_for94ybv.pdfIn PDF document text
    • http://koreanluxe.com/mepis3gml6.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/PZggKhk/rotiparibawisebinoriz.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/hgWpngo/pilumijupapizilaredup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_600b9876c26ae.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/whats_the_money_cheat_code_for_gta_5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitines.myartsonline.com/61648197928.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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 5628 bytes
SHA-256: 4daf1ebcea30a7da5abf18573562035383de8e130138a88556330d219d72949b
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 10648 bytes
SHA-256: 64bcf670a735273f5bede9dc34df553d27f919983720b73b0913525c4bdeb2e9