Malicious PDF — malware analysis report

Static analysis result for SHA-256 68360b0d687bffe9…

MALICIOUS

PDF

79.6 KB Created: 2021-03-27 18:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53ccef6a2ea2090b53fcbf7cd750cf4 SHA-1: 905f4b17b204c7b8f8e865ef1259d43e846df1d3 SHA-256: 68360b0d687bffe909ad8bc72c879ab9e34351120134291480a257868970104a
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are designed to mimic search engine results, with one prominent link directing users to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://druttle.ru/wix?keyword=how+to+access+bellsouth.net+webmail
    • https://cdn.sqhk.co/naritiba/jbt3hja/64351547291.pdf
    • https://cdn.sqhk.co/kenipafitu/3KqcjbN/stickman_warfare_mod.pdf
    • http://doburepos.iblogger.org/information_about_school_foundation_day.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_ff949c5d4e2f43798141ec81181da854.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bcb0391f-b815-4e51-addf-615ac895050e/lopi_leyden_wood_stove_replacement_parts.pdf
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_20b73de7ed5a46ceaa0965bba42e2d3e.pdf?index=true
    • http://menogarelaxij.rf.gd/93623802486.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_8453f136fbd842fc8b35af0eb0f376a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a2af6c4-696c-4d90-bd09-4b1e72250730/11610520097.pdf
    • https://s3.amazonaws.com/fedufiporara/kifopa.pdf
    • https://s3.amazonaws.com/baposivarabuj/15534532785.pdf
    • https://s3.amazonaws.com/polexebuj/zonosusitewebajojadegi.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/vuzineworiwodexov.pdf
    • https://s3.amazonaws.com/dojonuta/windows_10_bluetooth_driver.pdf
    • http://dikivila.epizy.com/22122675130.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_78aca5649dce4c73b7a756bc457944d8.pdf?index=true
    • https://s3.amazonaws.com/rolefosiju/express_dress_shirt_size_guide.pdf
    • https://s3.amazonaws.com/sezewu/96283458566.pdf
    • https://uploads.strikinglycdn.com/files/f74bd1fc-24bf-4a22-8655-44f4888597da/62037838668.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/68870517007.pdf
    • https://uploads.strikinglycdn.com/files/abade20c-c702-4d1a-88f5-b000fc300687/fulezezebutopomabemakigug.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_off0000effb.bin
80e43b2540f94137c72cab5c35d744b9af40aaa5720d6a22c2443b9f39c6d9bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 5168 bytes
font_01_sfnt_off0001016d.bin
06bbc0c0d1624784b5076ca7b343e8933da223a86edf6280bdbe5bdf93c1cb63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 2112 bytes
font_02_sfnt_off00010b3d.bin
357e28d5cc2b66caba503f0955df384a080f0cc666dacf33206d7277e2dc597f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 10972 bytes

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