Malicious PDF — malware analysis report

Static analysis result for SHA-256 82972d03f2468a1a…

MALICIOUS

PDF

90.5 KB Created: 2021-09-18 12:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 974867b7dc04663c67bdda9e6d29ec0c SHA-1: 5643326c3d92af102df9ddc327b67c52de5310b5 SHA-256: 82972d03f2468a1ada478d62944e499e8dd17deab6e5a9342e05fe8f03fbc692
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with numerous embedded URLs pointing to potentially malicious or phishing sites. The presence of a disposable link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://plantbiochem.com/ckfinder/userfiles/files/nadebikemizubufazitafubo.pdf
    • http://lexen.ca/userfiles/files/tosanosekebevibabozel.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/82937104289.pdf
    • http://travelshops.pl/userfiles/file/fujorijinixuk.pdf
    • http://rajskiewakacje.pl/userfiles/file/vudekigulozavifi.pdf
    • http://timandlor.com/userfiles/file/suredi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7820l9aef33gf02i913codn7dq/19633389532.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/21768119352.pdf
    • http://veterky.ru/ckfinder/userfiles/files/50303627320.pdf
    • https://samoinstitute.mn/uploads/assets/file/wujonawulatenif.pdf
    • https://ikansambel.com/contents/files/fomomizalamabinujodav.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29624805156.pdf
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/guwuzepepi.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/lamaxeg.pdf
    • https://rpaxis.net/userfiles/file/lemizivofe.pdf
    • https://all-new-wow.com/upload/files/sedegufudemi.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e95ad04---64122319958.pdf
    • http://vertex-decor.com/userfiles/file/zefegi.pdf
    • http://pataibicaj.hu/userfiles/file/23387016153.pdf
    • http://zh-huaxun.com/uploadfiles/files/10723079910.pdf
    • https://senarathgroup.lk/assets/media/file/vevedevumilororoguv.pdf
    • https://egokituz.org/files/galeria/files/bemet.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/sigukugirovalenupudiruni.pdf
    • https://gangnampools.com/contents/files/kobofofikabapuwetelu.pdf
    • https://asiantms.com/ckfinder/userfiles/files/datuwel.pdf
    • https://avigailpekelman.com/sites/default/files/file/raserodububa.pdf
    • http://traslochimontalto.it/userfiles/files/10714416498.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kimetsu+no+yaiba+movie+infinity+train+full+movie
    • 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_off0000ee20.bin
f1f84c9bcc440442aa032291891a955960c91192d3c9ee7214e6f38bf5e6a156		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 23028 bytes
font_01_sfnt_off00012aaa.bin
931f65354ba7c0b766fc199016021b8b639764ca2c6b61bbe0f599dc87e5ee0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 10788 bytes
font_02_sfnt_off00014396.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14396 16792 bytes

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