Malicious PDF — malware analysis report

Static analysis result for SHA-256 83de6638dbf3323e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 21:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f43e2a0726a48556882f2f4e88ced390 SHA-1: 38e4931a85285cb618769dfadf35608ed3b2f7d8 SHA-256: 83de6638dbf3323e6c0e4ba3bab76d0c67fdf75002e51ecc8e440bc44bfa5932
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm or phishing document. The PDF contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious websites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=ios+for+android+phones+download PDF link annotation
    • https://topclassgardening.nl/images/file/zowezurigijiv.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/dejuzajigirefisavirokaf.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/65410771907.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/32450359148.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/buxofojij.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tewezofigavo.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/gebuwove.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gaxoguzosof.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/xepekapuzuboj.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/7540547292.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/tisigoxezasazisisapur.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/zuliritaligiresikel.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/sikavubo.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/73725536405.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911011752_gb4cy0.pdfIn PDF document text
    • http://runhouchem.com/upload/files/zawiv.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/batukabunox.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/witubikemaxujufofoju.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/newulakelejikupezodenixip.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/51691725269.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lugopileremunufevuvidis.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/bilifusenu.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/85031534755.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/megiripulezugiratasedafa.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/rilexavazederibis.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/gujizusunibirijujip.pdfIn PDF document text
    • 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 17764 bytes
SHA-256: ec47a32fbc3e0975827c3322447edd020ecf39bc975f4596d651a8bb71e1c5f3
font_02_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 10536 bytes
SHA-256: fd49b96e50a73b094764f7c3019bef84b4c49ef690a01c53845822ffe34c4073

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