Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef816d60de24c2e…

MALICIOUS

PDF

92.4 KB Created: 2021-02-06 01:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2e875b1797024cfed78d799391d6a5b9 SHA-1: 01ccfbe0da983fccdba7ed9442f10072d14e5cee SHA-256: bef816d60de24c2e80aaae2a555061d5bb673c7c1169ac6d3b771654e5ccf6b3
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are presented with search engine optimization-like parameters, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution scheme.

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://crophysi.ru/123?utm_term=us+cma+books+pdf+free+download PDF link annotation
    • http://copyrighthelpcentral.com/algebra_worksheets_8th_gradeytnsm.pdfIn PDF document text
    • http://dontbeshy.xyz/justin_bieber_believe_song_free6qhdy.pdfIn PDF document text
    • http://biolinkus.me/xuvuzunatezobyx9bw.pdfIn PDF document text
    • http://instacopyrightcenter.com/asme_y14._5m-_1994_freel9kfr.pdfIn PDF document text
    • http://italiahot.space/authorization_letter_for_claiming_documentsiugul.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/ghTXP8h/kapamudi.pdfIn PDF document text
    • http://goodnaturak.space/lofukosowozorafanolapey457o.pdfIn PDF document text
    • http://testrun.ru/baofeng_gt3_mark_iii_manual_espaoli4w56.pdfIn PDF document text
    • http://legendbilisim.com/competencia_comunicativa_cantu_flores_roquez2zg3.pdfIn PDF document text
    • http://biggymstoe.com/77670282438vvjw8.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/hdGibge/12538707332.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/hfhihhD/7963981681.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/Tr3RjaT/93049928891.pdfIn PDF document text
    • http://leafester.online/31571432956qg5m4.pdfIn PDF document text
    • http://frut-tree.site/xolofiwifuvusitokigoko0b4w6.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/jQGwjjn/33052869386.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
    • https://s3.amazonaws.com/limepusotanal/lokuveg.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/65919729968.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_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 5248 bytes
SHA-256: 4918fe14a849c497138e9f61bbb3361684f659945181ec72747026c3f39b066d
font_01_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 11392 bytes
SHA-256: d15434243ae9df20c64e7e268073f1a55162ef7b577e9e91c8547ec6b42d101d
font_02_sfnt_off00015601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15601 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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