Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3abffa731b8ce01…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 07:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa887050d99474642f6d63bbb4bd66f5 SHA-1: 900d99d5a2f070cec24b78ba3aa7c7fb83b85a4f SHA-256: a3abffa731b8ce017494a2bfcaf46c047cc09aa1c019435644cebc37f68609d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm or a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://polytex.de/sites/default/files/rojikukekeze.pdf In PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/lixexajuwofaresof.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/26028273890.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/notimus.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/280namta4cc9clqbasgk66n05j/91448177870.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/21874123405.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/44110505601.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/41184341419.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/43220912766.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/jowiwibopo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021932055461003.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20211001035634.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/20527374772.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/jifadimufiduvuwavudavup.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sewidapir.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/fugedirexetu.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/lutorugaleviranobe.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/62203604496.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/16138384192.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/wadobij.pdfIn PDF document text
    • http://yuha.be/_files/file/pewazosapoj.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/16453284024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=goku+super+saiyan+50000PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC00 15380 bytes
SHA-256: 39f4b9df30e6d76d96c0b5ddc4015e5bb6cd615af26e28de7c5416eb033304ef
font_01_sfnt_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 10704 bytes
SHA-256: 0aea4f6e2f8eac3231f382e844b12ea36c0847f6fbf23f21a056b0aeef648d47

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