Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcd59134ec1aa09…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 20:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61f15f507946eb9d319ba1fc3d1ea2a9 SHA-1: 7479e9e799a5cb6b8745718b25394ea01d87d389 SHA-256: 7bcd59134ec1aa098a48a7df0d8f4cfc89df1c53b8b6f6d943fd748cad27be8c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to a suspicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the link farm suggest an attempt to redirect the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://jacksth.ru/strik?utm_term=nutrition+care+manual+cost
    • https://cdn.sqhk.co/vanewano/gyheide/19032908607.pdf
    • http://duzegipim.22web.org/aparato_digestivo_organos_y_funciones.pdf
    • http://fovikoxesaweziz.medianewsonline.com/56639123860.pdf
    • http://vibolofisef.mywebcommunity.org/crown_xti_4002_sell.pdf
    • http://mopowataxix.medianewsonline.com/universal_studios_florida_map_2020.pdf
    • https://cdn.sqhk.co/jakufomego/hjajfBx/super_bomberman_4_passwords.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jipizizesotexo.rf.gd/dujuxe.pdf
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_584d60c8e01e44e5a69059370ceb7e36.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_94f517e587044edc815c3012f7e3246a.pdf?index=true
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_def7d32055a44b33bec7885eb87c611d.pdf?index=true
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_60164a54ea2e425ca74683912bd5cc06.pdf?index=true
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_682b1a8660cf449db7c97de812c9f16d.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_0b1e79cb32e4495d8f1525fc2845e90a.pdf?index=true
    • http://begafunif.epizy.com/2400_calorie_a_day_meal_plan.pdf
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_632b4cbd56cd489889966328d5b33cba.pdf?index=true
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_f228d826da28471ab40b393471cb0193.pdf?index=true
    • https://uploads.strikinglycdn.com/files/404b7cf0-f2c9-4331-bd26-a073a69c9a6f/vudebafisisu.pdf
    • https://uploads.strikinglycdn.com/files/6e8af9e1-e7c8-416f-b556-2dd7e32055d7/ruvizu.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_a83ced78cad1472db599c45e21344676.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_off0000ef92.bin
bc01eaf84dffe0dabfec8746ed568d061e6d006668094cf272dc06836cf91ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 4916 bytes
font_01_sfnt_off00010034.bin
aeb084d13961e5272ceee2ced4988647a296e06f175613e37b1d447c95426e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 10624 bytes

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