Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc1b065c1338896…

MALICIOUS

PDF

72.3 KB Created: 2021-02-14 03:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a7afa99955785529b86d8e89bd9bca40 SHA-1: 0ce69b74eb292cc02d44515abbbdbc0d9ca0b67f SHA-256: 6cc1b065c133889670043de9de6ade3b932b4187a105792736513f5c2e740be8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains and potentially malicious redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure suggests an attempt to lure users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=htc+unlocked+phones+for+sale In PDF document text
    • https://cdn.sqhk.co/dugixikisim/hqivfCl/ikea_brimnes_nightstand_hack.pdfIn PDF document text
    • http://securityverifiedservices.com/descargar_libro_de_yunus_cengel_termodinamicag8tog.pdfIn PDF document text
    • http://maddot.space/tamefolonugomuxjkwkp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5fee67731a417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_60121315a4cf2.pdfIn PDF document text
    • http://macsk.space/79367236358qvnch.pdfIn PDF document text
    • http://ins.expert/5187282337sefjz.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/iIHkijy/78705074774.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/EKVfhcy/neighborhood_credit_union_routing_number_arlington_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/hfK5iaq/real_car_racing_2_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd638cd77225.pdfIn PDF document text
    • https://suruvimaweluza.weebly.com/uploads/1/3/4/1/134131456/b15e0be35df8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_60014c3c4c5a6.pdfIn PDF document text
    • http://spain50off.info/free_checkers_games_online_against_computerngsr1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10D 5268 bytes
SHA-256: b7c6412febcaa886528f11deaf188719c0b7cf76c1d608348745f0a104a99e81
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16124 bytes
SHA-256: 03ed8809cd8cf96d09cba4678b90b8c47cfa500dd05a1435749f6bf925b6d4bb

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