Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af600bee493c2ec…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 13:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43fc961e741b802473c8d0dcdee91f93 SHA-1: 2e1a9f49f0ab47961d95562ff86962d4e23285e6 SHA-256: 8af600bee493c2ec1a28ad9a3b2768862f8c14ed2aefacabb75fa5c78cb06b5a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, many pointing to unknown reputations, suggest an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ks-system.co.uk/ckfinder/userfiles/files/65447819542.pdf In PDF document text
    • https://satybharat.com/ci/userfiles/files/420150719.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/89056983390.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/39771402515.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210916110323.pdfIn PDF document text
    • http://pedraferro.com/files/files/25863624908.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/tedure.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mikojajomuso.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bujejako.pdfIn PDF document text
    • http://cloverdiamond.com/file/63975506521.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/bolukozovojidapijepareze.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/jukobavidinipirabu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ac3eb8f4---potikif.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/12909703883.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631523054.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/keruvosurapu.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/13765768300.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/vodekekiwif.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/suduva.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/8266593390.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ac4bf633ea1e95ffebe13ac7e6db6f73/tomowebuwomugu.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/99007696169.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/27041291956.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/44323727923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=scatter+graph+examplesPDF 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_off0000b1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 15960 bytes
SHA-256: 550a62fe9e893ac289587c0d493181bd487ef1c70937333836eeb994254db88e
font_02_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 10680 bytes
SHA-256: 1fd8fc1100644ee6ee3d46a3ec07072a3ac96f14db9736bbe4aa74adb7d75c8a

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