Malicious PDF — malware analysis report

Static analysis result for SHA-256 886df11f97e89c80…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 05:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f57bb6be7187db93d5358ce7563d55c4 SHA-1: ba5acc9950ee28c0f9bfe37d4844d312ff54c625 SHA-256: 886df11f97e89c80b81071ace62f8e5ecce468330733f1f454bfe854e140aa77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDFs on unknown domains. The primary attack pattern involves directing users to these external, potentially malicious, PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://venus-forever.com/image/files/susugewaralel.pdf In PDF document text
    • https://soudurelauziere.ca/upload/editor/file/gafufevafovapu.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/56585252917.pdfIn PDF document text
    • http://www.centralperdana.com/file/6036765905.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202198444156038.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/boratofew.pdfIn PDF document text
    • http://modero.vn/upload/files/kivavewiju.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/14564674834.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/manekotafosinixofusefo.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/92890775828.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147ddf974a98---54332983266.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109020756293410.pdfIn PDF document text
    • http://test-immo.com/file/lagawasorabifo.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/dulalevo.pdfIn PDF document text
    • http://bociany.sk/media/file/60593342176.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/46874402651.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/sopodu.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/76778141422.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149257741639---75432779947.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/72636080044.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/48038303794.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/vebezukomole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=atlanta+season+2+123moviesPDF 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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 10560 bytes
SHA-256: 6e739cf4df7ac462afa4dc64f94bb721532122884bcd736083fa4f0fcd6f5465
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 17316 bytes
SHA-256: 3309e01638ee4ca064f17eeae619a2166e41e3d59ab0fe9ccae79f0b41813bb4
font_02_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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