Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d6c8910935f19d…

MALICIOUS

PDF

70.9 KB Created: 2021-02-26 01:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8a0989c8004cf8d2434d2b4002cfeca0 SHA-1: d3ffcb08a5cdac120b121ea53d076763e907501b SHA-256: 88d6c8910935f19d8c2284ad5142957a78f23b608dad81f9013a8f6d15df379b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting an SEO link farm or phishing operation. The document body, though heavily obfuscated, appears to reference a manual, which is a common lure. No scripts were extracted, but the presence of numerous external links points towards a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://crophysi.ru/award?keyword=john+deere+gator+hpx+diesel+manual PDF link annotation
    • https://cdn.sqhk.co/ributexovek/ididzQ6/79741288138.pdfIn PDF document text
    • https://kojaxinepizoju.weebly.com/uploads/1/3/1/8/131856409/1023a3cf8.pdfIn PDF document text
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/farejate.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/kodajemesafixiwukipokiz.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/thank_you_for_being_late_friedman_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/qhfiejd/marvel_stadium_restricted_view_seating.pdfIn PDF document text
    • https://cdn.sqhk.co/foxidagon/V6sEEih/30636983638.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/lijurezovalunipej.pdfIn PDF document text
    • http://desokore.medianewsonline.com/46373865047.pdfIn PDF document text
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/wadonamizonomepibu.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/0473a306cef5.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/7975471.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/65db5563a3.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/xutedirokeruxas.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/joriged-ripudazabuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ralirajuz.atwebpages.com/15157886625.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/nanajuwefidevivixebaka.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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 5432 bytes
SHA-256: 5b90620fb938c3def55ed53c2f546ea82b6eabe31bd086ba861fc5aad0ccec83
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10052 bytes
SHA-256: 3f5d9b06c02e94c4258314f304bd5e1146ea80dec92b309d01eab0f6cfb08355

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