Malicious PDF — malware analysis report

Static analysis result for SHA-256 6549a72eee0b2ef9…

MALICIOUS

PDF

86.2 KB Created: 2021-03-15 05:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5235aee972982376dfc84a9722db596 SHA-1: 255ed3817ffc0113c852877af8789c0b4414140e SHA-256: 6549a72eee0b2ef9d700ddf7bbc47956693c59dfcb15023dc9d253dc9dfb41a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL being https://druttle.ru/wix?keyword=st+joseph+shrine. This behavior, combined with ML and ClamAV detections, strongly suggests a malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=st+joseph+shrine
    • https://cdn.sqhk.co/wizevomorofe/jieibji/ruxowesazasod.pdf
    • http://pobesegu.scienceontheweb.net/how_to_reset_kenmore_washer_machine.pdf
    • https://cdn.sqhk.co/dekaroku/gYhjeig/91595202649.pdf
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/5359603.pdf
    • https://ripufimavewin.weebly.com/uploads/1/3/6/0/136099474/jekadakojufa-sotinaxifo-kenup-jutulan.pdf
    • https://fimizugowukabi.weebly.com/uploads/1/3/1/1/131164572/piwuf.pdf
    • https://cdn.sqhk.co/liminekaj/hgijhcY/93012490035.pdf
    • https://cdn.sqhk.co/pawekenu/saie2hd/fijusekasutiv.pdf
    • https://cdn.sqhk.co/zimuteraf/phjwxii/28798348367.pdf
    • https://cdn.sqhk.co/zirevazul/jhfA8ha/98718194729.pdf
    • http://gosugas.getenjoyment.net/circe_book_characters.pdf
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/3669390.pdf
    • https://cdn.sqhk.co/vexorikodo/hjKicii/advisory_committee_on_immunization_practices_guidelines.pdf
    • https://cdn.sqhk.co/dabebasavus/KFEgi8g/super_jabber_jump_2_level_35.pdf
    • http://redofokotab.sportsontheweb.net/61609663544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be6bbf64-bffa-4664-a913-4f6a3ded1eb8/1330187092.pdf
    • https://uploads.strikinglycdn.com/files/2e977c04-7860-4af7-bb20-5f1e012244d3/dekalb_tech_college_cdl_training_program.pdf
    • https://uploads.strikinglycdn.com/files/6e8d45cd-24bf-48ba-b8ca-afa5cac57d82/breckwell_pellet_stove_p23fs.pdf
    • http://vegubom.atwebpages.com/calendario_biodinamico_2020_espaa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8b.bin
fa86af66c58e4465553199d9f4767e81aa158b9a10a3fa9a1a22d8eafac5a48d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 4844 bytes
font_01_sfnt_off00010e00.bin
3e81339d5fda82e3340deb5e6504e14947c64922c99fa4faee88ff1f57866970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 11772 bytes
font_02_sfnt_off0001365e.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 16204 bytes

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