Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf8b092880f56f2…

MALICIOUS

PDF

80.8 KB Created: 2021-06-13 18:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ac047ede4aa2f8ad4aec36fbb1db7eb7 SHA-1: aab56d4b7cc1539e7c8616198a188da80c504424 SHA-256: bcf8b092880f56f2ad468489ff012eb36bc1d195bb7c88f45d7654c4fc20574a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure indicate an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/pbw?utm_term=the+wings+of+fire+book+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420608/normal_5fcbc9869ecc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_604222664aade.pdfIn PDF document text
    • https://tuwopabawebude.weebly.com/uploads/1/3/1/3/131382790/tebovegelilozu-vaporenelit-pitixilukot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5fc874c3de1ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_601a677a8a86f.pdfIn PDF document text
    • https://nawogixabejuj.weebly.com/uploads/1/3/4/6/134617161/6e3945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_604b70982dae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_600345e5c7d86.pdfIn PDF document text
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/ff51730.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/8847088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fe100214ef47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_6056782b27a22.pdfIn PDF document text
    • https://lonewarole.weebly.com/uploads/1/3/4/5/134593790/dulojiradase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosuvop.pbworks.com/f/the_surya_soldier_movie.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/399103363.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/pilowetovilunoxozeja.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144646626/rainbow_vacuum_parts_diagram.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/97025181815.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 5548 bytes
SHA-256: d807bf9064b90f5b8a2ccc32de11b09f94e775baa9220461aa157f4a0f106786
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 11160 bytes
SHA-256: a3cac18b36597b5906584ad6918c0ca9538f6fe24c511b453f8060d9935ece65
font_02_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 16172 bytes
SHA-256: 461a1578f80084b2f2ca998a6e716936969cc9b33b2976d66eaaa57f6abee57a

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