Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71d664ebeea46ab…

MALICIOUS

PDF

78.1 KB Created: 2021-03-09 10:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b106b590b1d2f653d8cbe4b1b6e75feb SHA-1: 29556444a280d2acc7b7f8629b1007b1fe0317a3 SHA-256: c71d664ebeea46abcdb061b7e44d35e1e9e2d54f248430d693a9a6d8da2b4ffc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic indicating a link farm. One prominent external URI points to 'zajinet.ru', suggesting a potential phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://zajinet.ru/aws?utm_term=hill+rom+bed+size
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fca52534dbc2.pdf
    • https://cdn-cms.f-static.net/uploads/4447662/normal_600dc8fe97e81.pdf
    • https://cdn.sqhk.co/merabuvi/Gbiiajd/11198199153.pdf
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/ece697.pdf
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/1354175.pdf
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/b68c10675.pdf
    • https://cdn.sqhk.co/gadewekunel/gdhbWND/traffic_tour_2020_hack.pdf
    • https://cdn.sqhk.co/zejejofe/ORfjcQD/29510129238.pdf
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/88949bdd06a63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4388c7bc-3e72-4e43-a7de-0a952e1376fb/92571932809.pdf
    • https://s3.amazonaws.com/kefefetafij/69989314072.pdf
    • https://uploads.strikinglycdn.com/files/4cf721da-02de-42f3-be01-ae31827af1ba/97510042190.pdf
    • https://uploads.strikinglycdn.com/files/728f0e8f-897c-4757-829d-9005aba12e81/jipolozitizonemipapema.pdf
    • https://uploads.strikinglycdn.com/files/a8c5caef-0351-4400-80b4-ce4aa0ebc26c/51251593950.pdf
    • https://uploads.strikinglycdn.com/files/70c83b89-09cb-4d2e-9ad8-8b3087a98b6e/how_to_teach_speaking_english.pdf
    • https://s3.amazonaws.com/nutanigonu/jamupuj.pdf
    • https://uploads.strikinglycdn.com/files/178adee5-e602-4ede-b918-c2f54c8ac409/honeywell_quietset_fan_repair.pdf
    • https://uploads.strikinglycdn.com/files/6027154e-88bb-4573-a9a9-16d58b6f225e/63980868613.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b0.bin
7638fe49b2dc07049696ee4c8096810c6be4d2cf15e4e35ee9022e75ed61db28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 3440 bytes
font_01_sfnt_off0000f4fe.bin
e4d8b60e1fd11216fa9c93e432b599ebfabcf440cd03996f0af640b32fbcfcf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 4912 bytes
font_02_sfnt_off00010598.bin
74ede0237dcb6577166473f50c5b8b393745af70668ae961aa5bcbffae9fb164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 11164 bytes

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