Malicious PDF — malware analysis report

Static analysis result for SHA-256 b617bdbb38365111…

MALICIOUS

PDF

84.7 KB Created: 2021-02-26 08:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8d3b300d245c354463cd3ea21b8dfab6 SHA-1: ab0e119f61314c198e385354795f5351c9e10306 SHA-256: b617bdbb38365111077a5b89e6c34987baa76ffaad0833327afe786a38ce0758
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 pointing to disposable hosting services, suggesting a link farm or redirection scheme. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

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
  • 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://baarspo.ru/123?utm_term=what+are+the+craziest+town+names PDF link annotation
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/jeremunegigowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fded17f72d1a.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/a37d401cf3f93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fd1fc1d01767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_602b4d6448d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5fd1748bdb4d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5fca6b2e04cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_602de1c35b491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_60224e1eef6b6.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/tivogog-wufaz.pdfIn PDF document text
    • http://rokamik.iblogger.org/53752629390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiforeru.atwebpages.com/74463879401.pdfIn PDF document text
    • http://wubijati.epizy.com/why_do_new_guitar_strings_sound_better.pdfIn PDF document text
    • http://vanofixib.epizy.com/34187416403.pdfIn PDF document text
    • http://wasalesex.epizy.com/audiobooks_iphone_free.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/dirk_gentlys_holistic_detective_agency_cast_season_2.pdfIn PDF document text
    • http://fereralud.epizy.com/20665741953.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_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 5164 bytes
SHA-256: 009ee7a272d4c2e35d4d60c9c1ad903b4a3e755094054b395312eb5a257181e2
font_01_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 12812 bytes
SHA-256: 167e850aea23284bcbdc799e8b3c61637975109de0a439db6632726468e90a59

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