Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b33920fad6c645…

MALICIOUS

PDF

71.8 KB Created: 2021-03-15 11:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4062b9d491dbe7e0cf4ce7fd2a376a90 SHA-1: 563715b55dfa794cad285051e7ccae1a4d9a9d5f SHA-256: 89b33920fad6c64550e800469d459c371ce2e4a542b68a1676e6d1dcd8f9cac9
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL leading to a suspicious domain, identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to a typewriter manual, likely a pretext to disguise the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=brother+sx-4000+electronic+typewriter+manual
    • http://dkblogin-de.best/70358366864mo8ll.pdf
    • http://fsbsiod.com/famosos_en_la_guerra_civil_espaolaeefap.pdf
    • http://resimpub.com/escort_9500ix_platinum_review1r8uo.pdf
    • https://cdn-cms.f-static.net/uploads/4454164/normal_601b4ba39f3c5.pdf
    • http://montana-media.com/does_iphone_5c_have_a_sim_card_slotxfcvi.pdf
    • https://cdn-cms.f-static.net/uploads/4370286/normal_601cbf147bf07.pdf
    • http://topchambre.xyz/ralena45g38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_83209b3fab6a4c739b448f3e761e1c3d.pdf?index=true
    • https://s3.amazonaws.com/xarojapi/kick_start_keto_diet_meal_plan.pdf
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_7beb7bd4da804969b9ca9b7cdf144576.pdf?index=true
    • https://s3.amazonaws.com/sesafefanulokam/ishmael_daniel_quinn.pdf
    • https://s3.amazonaws.com/dedinavesute/9812560087.pdf
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_0c7495fbe97c4200923456cc84e58165.pdf?index=true
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_4f1d214d152d48e09db077dd9c8a5630.pdf?index=true
    • https://s3.amazonaws.com/fajonubinomeder/lozelotuzopilulezuni.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_1a20637830ac47e282a0e310d8260da4.pdf?index=true
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_d670f9c6c0b449d48a1806e24ddd025f.pdf?index=true
    • https://s3.amazonaws.com/pukiza/mopumiduvijel.pdf
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_13254c865852490eae7618a993e59f55.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb54.bin
46265ce9d8efe228bd405451f196fb3b4cb0872075ce3192ee0fae32fecf80f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 5628 bytes
font_01_sfnt_off0000de6e.bin
bf076c826b0a0411ee72c213cae1b4ca56a87125fe486806f10c1aa9cce1d473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 11992 bytes
font_02_sfnt_off000104d2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 4324 bytes

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