Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1a38ec40414a16…

MALICIOUS

PDF

102.1 KB Created: 2021-03-12 02:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fd0d01a2e7b412e13a5f25c1ca0de27 SHA-1: b9728f719f9478c2beec3c62f31eedb96137027a SHA-256: 2d1a38ec40414a165e77713784a62ea059102d99b02896ce1c1c8b944bde5fd3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other cloud storage services, which is characteristic of SEO link farming. One of the primary URLs, https://jacksth.ru/award?keyword=catering+management+pdf, suggests a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=catering+management+pdf
    • https://cdn.sqhk.co/jeporikate/gf4XoZl/best_deals_on_wheels_auto_sales.pdf
    • https://sinidagiritab.weebly.com/uploads/1/3/5/3/135386058/1075887.pdf
    • https://cdn.sqhk.co/romilononove/aia2CtX/alphazero_research_paper.pdf
    • https://loworukad.weebly.com/uploads/1/3/5/3/135312099/kigegapadevopinosi.pdf
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/nobagulide_sipebadapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xozeb/97905505418.pdf
    • https://s3.amazonaws.com/latufenaw/33154696327.pdf
    • https://s3.amazonaws.com/fujadabez/nazudamonatiru.pdf
    • https://uploads.strikinglycdn.com/files/163793db-7b2a-4611-9811-a2224db87a51/cell_phone_cases_for_alcatel_3v.pdf
    • https://s3.amazonaws.com/towakog/wexusilag.pdf
    • https://s3.amazonaws.com/davubewu/xoratexifagexi.pdf
    • https://s3.amazonaws.com/vexeliku/kotolewilus.pdf
    • https://uploads.strikinglycdn.com/files/ac9db53a-d599-47be-97fd-b8f4b1ac0fee/44495486937.pdf
    • https://s3.amazonaws.com/safenalavojuwu/hansteen_holdings_plc_annual_report_2016.pdf
    • https://s3.amazonaws.com/mokamoba/97036325232.pdf
    • https://uploads.strikinglycdn.com/files/c1c2cff2-3044-4b85-8a75-c771239ebb2e/53259776382.pdf
    • https://s3.amazonaws.com/xarojapi/gallatin_river_fishing_report.pdf
    • https://uploads.strikinglycdn.com/files/3126b6ef-0a12-408e-b033-cf0235451349/words_to_somewhere_over_the_rainbow_wizard_of_oz.pdf
    • https://s3.amazonaws.com/bomifabipi/17367355734.pdf
    • https://uploads.strikinglycdn.com/files/c119d02e-c87c-4657-89f6-532c19049d9c/toro_model_20017_blade.pdf
    • https://uploads.strikinglycdn.com/files/281266f8-62b1-4fd0-9430-de49df9e1a19/85207657610.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155a7.bin
3c74494eae36feb1a131907c6b297555714a0a43bdeadcf2bd093e2f10c54cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155A7 5056 bytes
font_01_sfnt_off000166c2.bin
7b22d46ddb3ed92c5410521bd50c026c04330fa98558198b58517e1a2ad3849b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166C2 10880 bytes

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