Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f91f0c6a8b8902…

MALICIOUS

PDF

78.4 KB Created: 2021-03-09 21:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 055d6621fc8a2f863b5211b300b1ca13 SHA-1: 6ed8c24c81a4fcb563e17afb1e38b13aece8a74b SHA-256: 36f91f0c6a8b89025fda2d0621ab1df79ebd7ae6bb65eb00cf1ca2619cdb2f6e
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it's a crafted document intended to appear legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=calendario+agosto+2020+pdf+para+imprimir PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ff16e5547e00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_60039720ab56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6039a434ec5d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_602ebd94590c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5ff3d1635088b.pdfIn PDF document text
    • http://mavurelaro.22web.org/bollywood_new_movies_free_in_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_60253d51f2685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_603fd5d11b7fd.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/Vgc8sgf/libopulesawamabok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_600b2238ab702.pdfIn PDF document text
    • http://virinuwatun.iblogger.org/dark_alliance_gary_webb_barnes_and_noble.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/L1igihj/ice_cream_cake_recipe_pampered_chef.pdfIn PDF document text
    • https://cdn.sqhk.co/kowetitemaro/DhjstJY/pogotugix.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/jfib1Mk/13838453877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fe18f1827e7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f09cff6-6e66-4ce3-bda7-c521199efad8/88077274272.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_8e2c4cf10e7b4ffd8d0a29865c9ad805.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_c3a2199a349f413184389a5dc40633c4.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_42cc87eb9c4845cd84c3ca7fc3bf39d2.pdf?index=trueIn PDF document text
    • http://pidifuwamofuw.epizy.com/can_you_connect_to_facebook_on_a_smart_tv.pdfIn PDF document text
    • http://sojopisosifa.epizy.com/pawudum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648e830b-e657-4888-8193-3a0938e198fb/37873275203.pdfIn PDF document text
    • http://sogaviwezed.rf.gd/97705569589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ccd7e4-7b63-4c26-9b09-40c58dc1a4ff/new_sat_reading_passages.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_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 5540 bytes
SHA-256: 866d834c1b5614ef3ecbc3cd6dc9e772e8a3d8ec96ef82ab2f5216f1a03a28d1
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 11972 bytes
SHA-256: 8b525887aa9d94113af7819b4a662157e1a1886c357bdedfb22b4eaa783e95f1

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