Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8a2f9fb3152173…

MALICIOUS

PDF

95.9 KB Created: 2021-02-25 23:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6cd778fa4f8073fa81d34396dbd633e6 SHA-1: 431eefb5d242b09a1ea00f1c3ba93fe7fd58acf2 SHA-256: fc8a2f9fb31521737b59ad62b69839d0df6716728ff92b19579a4782cd3c4349
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or redirection lure. The presence of a large number of embedded links, including one pointing to known malicious redirector infrastructure, strongly suggests an attempt to lead users to harmful content. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=why+do+birds+of+prey+have+yellow+feet In PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/a6c49932.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/WrIjixH/group_photo_maker_app_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/sopaluwokaja/TATXbAZ/doom_eternal_heavy_cannon_precision_bolt.pdfIn PDF document text
    • http://gtomishebs.xyz/epictetus_the_handbook_section_28zntpp.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/gc3YKMZ/the_best_radio_hits_70_80_90.pdfIn PDF document text
    • http://geosen.net/dun_and_bradstreet_small_business_credit_reportbsrgo.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/concepto_de_identidades_trigonometricas.pdfIn PDF document text
    • http://topstop.site/best_cheap_android_car_stereo_2019ry2ry.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/bugibupiwupixajezakafowugahc34.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/cidrjiQ/52119449894.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/Psbjihy/mens_pocket_watch_tattoo_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/u8djcjj/slim_pencil_christmas_trees_on_sale.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/nasobafaberuzu.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/laxilonoxifime.pdfIn PDF document text
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/xurinekemirudu.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/mAjaijX/90417530105.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_off000137bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BB 5536 bytes
SHA-256: a855679f96d1513b451eee5af107d0f486a9395ae8a23b8f3b6256254da1cedf
font_01_sfnt_off00014aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA2 12720 bytes
SHA-256: 2eede9fd290a30010485851c46be6ce26fb1a05d8d43ea0c36f5b0eb6b6f4962

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