Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa39d3a3e7826fc…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 12:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ccb376a4d3f2734ece26c32cbfa5af09 SHA-1: 3cd0c8c4d03d61bb150de242273c9bb9b5e66daa SHA-256: 0fa39d3a3e7826fc9d2298ebf054f9d21578a6e472652cc1b8d89a147e6bbc4f
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. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings point towards a tactic of directing users to potentially malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://midufefew.ru/wix?keyword=google+drive+templates+calendar PDF link annotation
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/lunuzul_luripa_doroxodekubigam.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/jiiIwjh/ps4_game_box_price.pdfIn PDF document text
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/bifiwedipudose-namexug.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/2568565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601b004fb59fb.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Zcjagij/57371522425.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/7471879.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/143ca3bfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_601aab7f40d2c.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/sufesilatuseto_junak_gugapimugaro_lesara.pdfIn PDF document text
    • https://cdn.sqhk.co/piwojosexaja/hcjeXL4/pottery_design_ideas.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/zurego.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/bl2Sijb/joker_2019_bgm_ringtone_free_download.pdfIn PDF document text
    • http://sewamagiz.66ghz.com/alberta_snow_goose_reports.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://migotebixum.rf.gd/nupef.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/acting_resume_format_no_experience.pdfIn PDF document text
    • http://nuxidowu.epizy.com/sikes.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 5272 bytes
SHA-256: a7897e83080fe3508c8d57486198c27b40a6754a86c43f33517d5e197ad855f1
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10184 bytes
SHA-256: 9025f30e4f51f925422c094e75fcf469289b1f0c55ee0573ac13db1b11c59e0e
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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