Malicious PDF — malware analysis report

Static analysis result for SHA-256 5201692230bee52e…

MALICIOUS

PDF

85.7 KB Created: 2021-10-13 13:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37afd17a2c2a4208f323158dc573e7ed SHA-1: 8884b97c504d4f4a63c06ddf8b973c76b9705edc SHA-256: 5201692230bee52e48fa5599b788d3b83e3783103ed4e65a52af20cb5cf6696a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910eadd368---68646222095.pdf In PDF document text
    • https://macjiboter.macjahisa.si/files/file/45605873163.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/48940218298.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/79409111105.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/31266641244.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/rolulodu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b568a458fd---79393324719.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/97570959238.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/zunenukuso.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/40487243906.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/77251593673.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/24770306380.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/21575224703.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/niduxovusuwagapabof.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/wizavivizokukaje.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/51529302567.pdfIn PDF document text
    • https://papiratisk.cz/soubory/87578440464.pdfIn PDF document text
    • http://saint-party.com/media/file/60383842727.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/62928514645.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pusufekuganolifib.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/zegamepovepenolijiwoki.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/77478388428.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/jajuxoxavogapijupetaxu.pdfIn PDF document text
    • https://foulardfotografando.it/file/fifigurutoluwariparapefir.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/tevomufebugibar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=the+wonderful+words+poem+questions+and+answersPDF 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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 11060 bytes
SHA-256: 0fb7c92490173012d5c5b082a6f0fe9ae4bdabd0b5aed95e2eb8b3229b036c62
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 20936 bytes
SHA-256: 59c8826c366262a002bea840ce37acfba61cb1969a93d101990f140df5cd2b6e
font_02_sfnt_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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