Malicious PDF — malware analysis report

Static analysis result for SHA-256 690be9a23cda2d82…

MALICIOUS

PDF

77.2 KB Created: 2021-05-27 13:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 374424e93ead563f382f39e95ded3a3b SHA-1: 25820ca731f4824ebacb21b31d1eb90e05a4b326 SHA-256: 690be9a23cda2d82389f8a9fc17366adb91a2c2c52d4bf8fbeffe2d991f99a77
156 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to 'nipisod.ru', which is flagged as suspicious. The PDF also contains a large number of external links, many of which are to PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV both strongly indicate maliciousness, likely related to phishing or malware delivery.

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://nipisod.ru/strik?utm_term=how+do+u+make+the+blood+gang+sign
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/rukigef-gafimarol-nowiravu.pdf
    • https://fuwevegaro.weebly.com/uploads/1/3/4/6/134687734/moneximatoga_fitowoluxepur_xipusot.pdf
    • https://cdn-cms.f-static.net/uploads/4451766/normal_604b5d1bb632a.pdf
    • https://vefotufujipewux.weebly.com/uploads/1/3/4/4/134401009/dagekej.pdf
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ff13efa9714b.pdf
    • https://ruzamoga.weebly.com/uploads/1/3/4/7/134761687/8727253.pdf
    • https://sotasoniwolog.weebly.com/uploads/1/3/1/6/131637806/5484476.pdf
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/e1d58f5169.pdf
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/d31e8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/927446fb-f109-446c-a1e2-31fed3fc381b/kuxesidekivixofuxoxidifef.pdf
    • https://uploads.strikinglycdn.com/files/6512618c-4c4f-4849-8638-b8df05a56f07/76937460911.pdf
    • https://uploads.strikinglycdn.com/files/8a1971ba-6678-4c1b-811d-9d151001fc32/exterior_angles_of_triangles_worksheet_maneuvering_the_middle.pdf
    • https://uploads.strikinglycdn.com/files/68b8faa3-257c-4914-ab7f-313d12c2288c/how_do_i_change_my_greeting_on_my_panasonic_phone.pdf
    • https://uploads.strikinglycdn.com/files/c30a72b4-52bf-45ae-a68d-d6addc844b26/is_a_strong_electrolyte_a_strong_acid.pdf
    • https://uploads.strikinglycdn.com/files/995aa696-a36b-48cc-b73b-9237acb41f28/36318487820.pdf
    • https://uploads.strikinglycdn.com/files/e939401f-4a9f-4095-bafb-2c2e96a9c23e/2018_toyota_camry_hybrid_se_specs.pdf
    • https://uploads.strikinglycdn.com/files/5af1bc7d-05c9-4161-8075-23dffa19f5d6/76267088309.pdf
    • https://uploads.strikinglycdn.com/files/53494bdb-652c-42d5-ab96-cc9a1642e1c3/20032020598.pdf
    • 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_off0000efae.bin
aa62389a5cbd690eaed7951d368523ff0d39385fe30c58b750ee8ce64f78b0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 5400 bytes
font_01_sfnt_off000101f2.bin
e529dca113049613f0cea55b4352b6f0841f74dd8baab78c1d8da64479589b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 10584 bytes

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