Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd9ed67ded223cc…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 07:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0a10d52f87476897b4e125102cee49 SHA-1: 158064f2b14d4bf61de9a7dd98053cf315b2fa3c SHA-256: 9bd9ed67ded223cc0fb0ad1681072d72dbc98a0d24b066022393b5ddf914b393
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being https://dafemum.ru/123?utm_term=gta+vice+city+money+cheat+code+android. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dafemum.ru/123?utm_term=gta+vice+city+money+cheat+code+android
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/fudobuwiluwalo.pdf
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/342dde1.pdf
    • http://mekatososa.iblogger.org/chithari_therikkunna_lyrics.pdf
    • https://rufufuwoka.weebly.com/uploads/1/3/1/4/131454634/zemifobivagi-sobozipewif-valogol-fovodufiraval.pdf
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/bewanineti-pidufevazaj-narevuj-sisusafinewipo.pdf
    • https://lolekujawifom.weebly.com/uploads/1/3/1/0/131070351/fedaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_6605b3ff15f64a2e97dd53b55df58c0b.pdf?index=true
    • http://sawopigemon.epizy.com/29560168232.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_c4711b36763941628fe5f5573c46e547.pdf?index=true
    • http://kutubuge.rf.gd/antonyms_exercises_for_class_5.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_0bda8908b0494ddb9e0c08dd69e65aca.pdf?index=true
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_8d78935e1b044c49956d4f097c851746.pdf?index=true
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_4113095b4fa746ecad470430c312bbb6.pdf?index=true
    • http://zexeborora.rf.gd/37239816223.pdf
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_0e35af1b6d454212a9bb0361ca3f50fc.pdf?index=true
    • http://fupuzujovo.epizy.com/70979217367.pdf
    • http://lofitometuzaba.epizy.com/factory_reset_apk_for_android.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_0878ccbcb3724c5ca399c3c128c9351f.pdf?index=true
    • http://warazasi.epizy.com/45939582629.pdf
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_67772485cfef41149a32ed112e9d1bc7.pdf?index=true
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_6a4ac5b7ce4047eaa4ab78a33059d262.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_364ac8e1b12049a68a23bcdc63b3ffb2.pdf?index=true
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_9e80c347bd27460c9b4f06103d2ca017.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_8bfd36dce5de4f14b8bafc82ec3477a9.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_1f72be99f24d4fd3914c092e3ef463b5.pdf?index=true
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_48a09a3e7af64bcf96b4956684f8cd56.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc7.bin
1c3f8c6f1f9e091158d7e6a240a3d1d8c8274df02edb74e4a31b4b650beca011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 5164 bytes
font_01_sfnt_off0000ff3d.bin
166c004b15d2e22bd8a747c134aa344fbf65d00814689a142811489ed7fff6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10748 bytes

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