Malicious PDF — malware analysis report

Static analysis result for SHA-256 d171b016f6f2ff76…

MALICIOUS

PDF

78.0 KB Created: 2021-05-03 00:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 73f8549b352bb470466c3656f121ce0c SHA-1: f67197e09c353b9dba2a97e7419466f710e78dbd SHA-256: d171b016f6f2ff762e533b63514a884d365b7c78d296f278337af465d06c5f9b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious lure, likely intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://soxebez.ru/strik?utm_term=the+100+kass+morgan+characters PDF link annotation
    • http://resimpub.com/1818841531bbe7k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_602d6b27605de.pdfIn PDF document text
    • http://dajutim.22web.org/pujinusivus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_6000da5fd8fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_604a72d73ddd0.pdfIn PDF document text
    • http://daravto18.ru/gba_emulator_full_freev8tfu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_604780b9a7c88.pdfIn PDF document text
    • http://vinograd.io/72445457943pw4hm.pdfIn PDF document text
    • http://topsalon.xyz/ati_radeon_hd_3450_updatei785i.pdfIn PDF document text
    • http://sejusadi.22web.org/bewitchment_must_die.pdfIn PDF document text
    • http://procripton.com/steins_gate_ending_songfy7hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5ffba44369026.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rusozetowozo.epizy.com/92499695482.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/the_passage_justin_cronin_movie.pdfIn PDF document text
    • http://wivoruremuwun.rf.gd/64273532200.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/conversion_worksheets_grade_4.pdfIn PDF document text
    • http://jixetumoxefa.epizy.com/zebepewisodupofevixage.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/67832020060.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/19059413961.pdfIn PDF document text
    • http://joriboka.epizy.com/buffer_system_in_human_body.pdfIn PDF document text
    • http://zudovub.epizy.com/binomial_nomenclature_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 5128 bytes
SHA-256: 10c0e6a7e106f174f4b35108cfc385a2d015435b2bad7b55b3047ff285a9994b
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 10200 bytes
SHA-256: 657fa3327bbd550ec3de3d3ddc36a9f2d872e3fda253d7c3eaea610c8c321977
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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