Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fece31393f8a49…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 21:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01bc4f7c73ef37f64655ffb2c1647dde SHA-1: 839af5da8721d42dbf1ef1c5c926145c551f6b20 SHA-256: 09fece31393f8a490c1bf9ee2567e61b3cc45835b9351a424bc4a426f26e19b4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://saraya-shop.ru/upload/files/gebaduzapofitakes.pdf In PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210911_B89804BC39DA495E.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/pusoxuv.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/nibepogojupuzujatule.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/73879223402.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/4779373079.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/91043676960.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/86019322722.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/70866264863.pdfIn PDF document text
    • http://sushibelovo.ru/files/97401721927.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/39208818016.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/pukujaguzevi.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/47802321579.pdfIn PDF document text
    • https://adikkedua.com/contents/files/29597658291.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/loretufibopuza.pdfIn PDF document text
    • https://maisonforville.be/documents/file/34814152941.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091108192533.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109050604319175.pdfIn PDF document text
    • http://word.mn/uploads/assets/74979576983.pdfIn PDF document text
    • http://chpcentre.com/files/file/9226336158.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135696f1398d---tegujazowixopazurosujali.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/14771127874.pdfIn PDF document text
    • https://etadelloro.it/images/file/doxomipabojopekuk.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/77566647475.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/11424857009.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/90935122456.pdfIn PDF document text
    • http://szm.hu/userfiles/file/nijapadiwowoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ispoofer+pokemon+go+pcPDF 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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10468 bytes
SHA-256: 120dd7aba507c85c6b76836b8d5e68c4eba219155facbf8cec8872be54735b4d
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 18148 bytes
SHA-256: 25020d44ac7a11032e5663ec1396a4f5c2807fd705148414c347814756ecace8