Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa1ef7971d40b5c…

MALICIOUS

PDF

75.8 KB Created: 2021-10-04 22:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ceb7ac2d3291c02d3d57c262cbe44f97 SHA-1: 7d52cb8f9e1f5457c1345013bc3592c20bc211e1 SHA-256: 9fa1ef7971d40b5c5dabb5aefed720cd42a31a04768cdaa661e033dfc8e0e57b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across many disposable hosts. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=peter+griffin+forklift+gif PDF link annotation
    • http://multiflex.ru/userfiles/file/42833258371.pdfIn PDF document text
    • http://ndt-ultratech.com/files/17906066146.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/86706471696.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/6669068880.pdfIn PDF document text
    • http://chipgene.com/image/files/20210910_181734.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/42842967448.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/73128532724.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/26495992112.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/fasizigakelemeziserakani.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bekilimafududofulaxisi.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///37063413623.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/xifitajutob.pdfIn PDF document text
    • http://vanhacollection.com/images/files/3710883613.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614e031f588d1---tiviziwakozebur.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/rogewusifevejat.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/53057298381.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/45779453319.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jazojipi.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/73129707610.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/62524505006.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/juzuzelusaxuwiki.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/93030735632.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/31388211622.pdfIn PDF document text
    • 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_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 18076 bytes
SHA-256: 8d12491509e9676218118afa45cb4d58164d94aba61c375051272af6174df7ec
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 10152 bytes
SHA-256: a2cd98de0c3dabbbb72b4f2e287849f8847c90c0a159b4fed8fa1d5fd132d115

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