Malicious PDF — malware analysis report

Static analysis result for SHA-256 851d536170a5c2e0…

MALICIOUS

PDF

72.9 KB Created: 2021-02-15 06:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9eb1d4b078f0d4f1c1dad097c465b823 SHA-1: c2b87dfeb538969248ffec1ea8fb9d92475b16e0 SHA-256: 851d536170a5c2e0fc16a2143b75b57ddbea1d8e91170b91c0e4cccbc0f86ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with a critical heuristic identifying a "PDF_SEO_LINK_FARM" indicating a large number of linked PDFs. The document body, though heavily obfuscated, suggests a lure related to an "Experiment builder manual". The presence of many external links, including those hosted on free web hosting services, strongly suggests an attempt to direct users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jacksth.ru/wix?keyword=experiment+builder+manual PDF link annotation
    • http://togoxuruk.22web.org/partnership_deed_in_marathi.pdfIn PDF document text
    • http://visatog.22web.org/invoice_paid_template.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/5141673.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/jcjj5hd/brilliant_meaning_in_english_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/jc15mjf/touch_portal_vs_stream_deck.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/jjb4gg1/13362971383.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/somisilegex/fopalutolemesemapa.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/guided_tissue_regeneration_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/15083318311.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/31784160797.pdfIn PDF document text
    • http://ziboporo.epizy.com/guild_wars_2_guild_hall_guide.pdfIn PDF document text
    • http://xesepodine.rf.gd/business_intelligence_analyst_job_description.pdfIn PDF document text
    • http://bajofot.epizy.com/dedujuduvopusevuxizefe.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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 5092 bytes
SHA-256: dc88c2e4c3d8fcbd636f4b7155fbf5a37e9f7b16c1b999e2ac2bbaa42b10510f
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 10528 bytes
SHA-256: 08a4a87e485411870b27ec3d85663d3cd2396e3948ea4b871dfce2696ccf9f50

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