Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb86a0694b84b6a…

MALICIOUS

PDF

75.9 KB Created: 2021-02-24 08:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c958104491c0942fa836e3155efdab06 SHA-1: 1b1951b68e55d21d4db0bcd673c464daa538b588 SHA-256: 8cb86a0694b84b6a5763db7e5310f211b85f1244eb50563b5cd7c223162e0d55
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF documents hosted on various domains, including disposable hosting. One critical heuristic indicates that a link directs to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan distribution mechanism.

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://crophysi.ru/123?utm_term=is+cfa+more+difficult+than+ca In PDF document text
    • https://cdn.sqhk.co/semiwewedazi/jaiejjV/gopupewumizomigizedoxakew.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/fgchihj/41752758226.pdfIn PDF document text
    • http://universityru.fun/brother_mfc-_t810wstb03.pdfIn PDF document text
    • http://bluhgang.best/how_to_change_vivofit_4_bandajtf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_6016512c3ccf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fe165fb3a79f.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/haujhgj/atomas_game_tips.pdfIn PDF document text
    • http://levantemosaic.com/68786272331gwags.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/hV2klsZ/77141821021.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/VBkgjMY/939111501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_600361d7d4c26.pdfIn PDF document text
    • https://karuxuli.weebly.com/uploads/1/3/4/3/134377251/turiwipifover-gamemevefez-mewibasobi-purav.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/GTicsgc/21688715679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_601e49cecb79b.pdfIn PDF document text
    • http://daddytestit.xyz/21541843375m6r3h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_5ff4ccc8d03b3.pdfIn PDF document text
    • http://cartest.pro/candy_crush_soda_saga_online_unblockedm5vj2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibogifimot.epizy.com/9187074740.pdfIn PDF document text
    • http://vejawotivifima.rf.gd/lupefazogefezuze.pdfIn PDF document text
    • http://dejoruxebesinem.rf.gd/miss_sloane_movie_parents_guide.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/articulatory_phonetics.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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 5196 bytes
SHA-256: dd8f25cb37827e9370977b9f69b2e4f19dead9cf66b632dc12b0cdefcb2da716
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10980 bytes
SHA-256: 09dfdaad9e1f49f30e4f9fbc751ae2bfd91571fd74ef3ee3e644db05f5aee7ae

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