Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24306fc7a7dd649…

MALICIOUS

PDF

78.7 KB Created: 2021-04-04 15:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a85a1119449b3a7e801463a23cbe81 SHA-1: 1809433ebd8f43a4547450ff9c33001b78a8ac56 SHA-256: a24306fc7a7dd649bbd4c268fe43047e156777112d86564608dc61d79a15d7ed
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external links, with a primary suspicious URL pointing to 'soxebez.ru'. The heuristic 'PDF_SEO_LINK_FARM' suggests the document's purpose is to generate traffic or distribute further malicious content through a large number of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=enfermedad+de+chagas+pdf+gpc
    • https://cdn-cms.f-static.net/uploads/4475572/normal_601f5ebf550be.pdf
    • http://topcreditmonitoring.info/how_to_add_guides_in_photoshop_elementss2wis.pdf
    • http://esclub.pro/73446881839cuwel.pdf
    • http://onesmall.space/88865504139zrk1u.pdf
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/towonam-nabakepex.pdf
    • http://azakalaza3.xyz/epson_iprint_iphonemlwbb.pdf
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/edf1e4ef005e7.pdf
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5fdaf47086368.pdf
    • https://cdn-cms.f-static.net/uploads/4501991/normal_605b942937cef.pdf
    • http://wegansit.space/wupojiletazibezelogoguxz1tki.pdf
    • https://jerepubiz.weebly.com/uploads/1/3/1/6/131606505/4061236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_d64142a23de2429a84deaffdcab8c338.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_bf5a577067b546ea8662dd7747221091.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_63ecaefee8144465842460cdcb4431de.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_cffcce9987e54a11b91d39ee073433e2.pdf?index=true
    • http://lubudag.epizy.com/homonyms_worksheets.pdf
    • http://bageradafasuk.rf.gd/the_left_hand_of_darkness_audiobook_youtube.pdf
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_34c6c4db77864879ad24cb15068ccd83.pdf?index=true
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_a3805ab5772d4e52ae2c2abe82a5a9bb.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_be111f77b6924914b382b400228626e8.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_25266a10a8c147d8bcfeb79edead5891.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_off0000f3c5.bin
74112e8c4f45376b14d696f9bc164c712a7e1c651bbc94d3b6f54a9e1b008536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 5496 bytes
font_01_sfnt_off0001064f.bin
b69e671ea53ee935e2fbe34725766098af32dab64b79a76539e8b3d01ace556b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 11476 bytes

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