Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b926b35fb833d2…

MALICIOUS

PDF

66.4 KB Created: 2021-01-11 13:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f36774e5f263c8686c724fd79e107861 SHA-1: 75e186a107483405cf491348c6cd2cf17ef02be3 SHA-256: 65b926b35fb833d2f7707ac66f645596b882a78d5d2109cc7cafe1eedf21c2bf
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting services, suggesting it functions as a link farm for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs further supports a campaign-driven, potentially phishing-related, objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=ub40+labour+of+love PDF link annotation
    • https://site-1174882.mozfiles.com/files/1174882/defender_1997_engine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5fdfd705b2a6d.pdfIn PDF document text
    • https://cdn.sqhk.co/karelevo/ChdEhhJ/zojifijenodofoxopule.pdfIn PDF document text
    • https://site-1177257.mozfiles.com/files/1177257/26558876501.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/g0jcGge/california_shelter_in_place_end_date_may.pdfIn PDF document text
    • https://site-1177495.mozfiles.com/files/1177495/leather_woodworking_apron_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f999801a7637.pdfIn PDF document text
    • https://site-1168102.mozfiles.com/files/1168102/rutobejijofizijosurufobax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bofake/32336294955.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/54095611702.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_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 5004 bytes
SHA-256: 1a4160f3d6f1610c00b95b774cc9b4a193a02f3488ce9b6ec47ab4be19854fc1
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10144 bytes
SHA-256: 8395ffc58b416d02a02bf2f219d6fb1487fbd51e8655dcd3aba14cd871f27ffb

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