Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71344d401e33342…

MALICIOUS

PDF

68.0 KB Created: 2021-04-08 15:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b2dc25eeabe17a3f0b3deb4502f4603 SHA-1: 1cada61e0ba9e6dd3c61d537af7a63966bba1ebe SHA-256: f71344d401e3334226ee1a54de12be79e1381f7a330700ca32ccb241e2b036e2
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are structured as link farms, suggesting an attempt to direct users to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://web.liderpapel.com/sites/default/files/webform/kivalin.pdf
    • https://www.woonsocketri.org/system/temporary/webform/kebadewanizokodijixupid.pdf
    • https://www.jwico.com/sites/default/files/webform/71926652616.pdf
    • https://www.jts.org.jo/sites/default/files/webform/76938035167.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/ligexupasofobepis.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/12812059159.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/27999686052.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/42282539280.pdf
    • https://www.uts.cw/sites/default/files/webform/96040264728.pdf
    • https://www.jwico.com/sites/default/files/webform/monufugabezexi.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/34782296767.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/15691680518.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/niroxopewesanusogub.pdf
    • https://www.mainephilanthropy.org/sites/default/files/49101071505.pdf
    • https://ambrose.edu/sites/default/files/webform/65047245793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mappa+turistica+agrigento+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb64.bin
ccdb6d39c392cbca18f4481a2a5c6854b80edc854ad524e5b2fcd7df85ee9411		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 5296 bytes
font_01_sfnt_off0000dd85.bin
429395fa5fe1f909b984a5a8188b01bb32d32219d10132fd42c3ce40ee6bf103		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10840 bytes

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