Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4e0697e6abe98e…

MALICIOUS

PDF

92.5 KB Created: 2021-09-08 15:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 181106b34c4fb148527b59c53bde601e SHA-1: 88db9010f2e5f1f06aa9bcbd3db0adf5d297aaaa SHA-256: 3a4e0697e6abe98e0868b0217456a2a68742f1b617e80457c25b741248a930fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to obscure the ultimate destination or host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dsverano.com/UserFiles/File/68662698962.pdf
    • https://gtijsr.com/userfiles/file/piberunonego.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fef3cf78ca5bd70d1a157d36b7323277/zuwif.pdf
    • http://mondoacquapiscine.com/userfiles/files/pazetokokaw.pdf
    • https://fanaf.org/article_ressources/file/joxumebezisomajanafevare.pdf
    • http://jingyilin.org/uploads/file/pugefemobupabijupi.pdf
    • http://erainbowrealty.com/userfiles/file/841448196.pdf
    • http://ulsantour.com/FileData/ckfinder/files/20210902_A81D4EC248D21C3C.pdf
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d85f2434---17538918040.pdf
    • https://mbamantra.com/ci/userfiles/files/mulelanuzebexafug.pdf
    • https://ibeguiristain.com/userfiles/files/tajonovokip.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/durikomivifewelag.pdf
    • https://wemservice.com/ckfinder/userfiles/files/16313298343.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/dokovosotulegewir.pdf
    • http://geofer.eu/userfiles/files/sugafelugalupiwi.pdf
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/16473706394.pdf
    • http://profesniprukaz.cz/ckfinder/userfiles/files/11806099203.pdf
    • http://www.abcklima.hu/data/editorfile/rexifurumon.pdf
    • http://ropesadventure.com/d/files/74641601189.pdf
    • http://lawyergz.net/uploadfile/files/bajuxavavozibozetur.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/56856630787.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=david+pereira+neves+parasitologia+humana+download+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://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_off000100b3.bin
16761db4eddac09ba3cea36fddc8ffecd3c4b6035cf7b9e1b47c4746dfc52b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 18976 bytes
font_01_sfnt_off00013252.bin
a77e580c1e38fefbff5f7387c72e9e8001c97d87d97c054efbaddb8316e71958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 11196 bytes
font_02_sfnt_off00014c33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C33 16792 bytes

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