Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ce1592d55bf975…

MALICIOUS

PDF

97.0 KB Created: 2021-09-12 22:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9bb0c70231dbe2570366b6321a370a47 SHA-1: 35287d70e72a8f1f6300c03ffabbb0fcc939fc5d SHA-256: 91ce1592d55bf975f3c9baf3ffe2193a0a4b09a90f0cf260d9208cae8138d364
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware through a network of linked sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://wienbildarchiv.com/upload_files/files/wimasologimemigaxomor.pdf In PDF document text
    • http://szyoujin.com/UploadFile/file/20210912041948224.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/87963618669.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/mugufaruzeloribel.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905001027.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/74872066583.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109121132214962.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/70945185107.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/wexujatenigenezojo.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/filubonaginas.pdfIn PDF document text
    • http://vkts.se/userfiles/file/3273706147.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/10620543249.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/36258904284.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/20694821436.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/kufinegebukenituz.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/94307147178.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/devizesunanerosenovomevem.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/66707590358.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/siresipu.pdfIn PDF document text
    • http://sial.pl/galeria/file/dawinesise.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/19950592876139e7e37da57.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ola+tv+alternativePDF 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_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 19292 bytes
SHA-256: f62dc30c4dc6b52c3d27d4dfef131dd847d3b335d788fe441172be87ebc65ac3
font_01_sfnt_off000148c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DB 9904 bytes
SHA-256: 1d23b9a342d5f29b20975635cd42bbf284867b3cf1893d4836b6386a95a160cd

Open this report in the interactive analyzer, or submit your own file for analysis.