Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb08a2660683b6ed…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 16:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa616b1f41cbfea519bade9b341ae603 SHA-1: 52fd40c6c1b92103f612bc934ce246d09aa8fa71 SHA-256: fb08a2660683b6ed254e550942d7e26d2fe5eb67918966f4c28c91f024f11f0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/jezesizorotapujubewu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393d6debf14---91009618863.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/31796640129.pdf
    • https://urologasdainys.lt/userfiles/file/sapowepipibak.pdf
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/fobudeladebomu.pdf
    • https://universal4shipping.net/userfiles/file/58969172560.pdf
    • http://gerastar.com/userfiles/file/lutubat.pdf
    • http://bnblspecialities.com/userfiles/files/2795737635.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/xegomenimof.pdf
    • https://alley.52886.tw/uploads/files/sumazasugitemidipuri.pdf
    • http://ukwoodrecycling.com/userfiles/files/62632356286.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/22435402322.pdf
    • http://absolutelyneon.com/userfiles/file/14214954722.pdf
    • https://faktxeber.ru/resimler/files/jadigatufar.pdf
    • http://orenprom.com/img/account/file/luxajiremejujorosubatuwa.pdf
    • https://sindonis.com/userfiles/file/94700789524.pdf
    • http://pataibicaj.hu/userfiles/file/94625635921.pdf
    • https://binarbaid.com/public_html/userfiles/file/10736147506.pdf
    • http://euskararenginkana.eus/files/galeria/files/sigemonajefoliv.pdf
    • http://kirakuramen.com/uploads/files/letevedenuwaxew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+location+for+spoofing+pokemon+go
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0d0.bin
149bf5743d673e512e5da34354aacbf6ca4f9f2dfaf59a9d9ad02157a1d1ac14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 16072 bytes
font_01_sfnt_off0000d999.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 16792 bytes
font_02_sfnt_off0000f1b0.bin
ac647d702e72d10a6d8d434a2c533ca60a328cd9f7d7109a1dc16742e2e8fc8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10968 bytes

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