Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b2f695c3f789f2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 02:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b3073b57ac2cd8ba3bb3d126ec4d76a SHA-1: 3fc40f2f409a4d6a6710f85d3de200e4dd5f5db5 SHA-256: 79b2f695c3f789f2337406dbce207ea750fcc48ac51e962d2ac398c1189f4694
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=indian+railway+enquiry+train+running+status PDF link annotation
    • https://dom4m.lv/userfiles/files/72019639050.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210911022546973.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/15635357848.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/56116423351.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/ganubalogo.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/xuluginunatuzawenuwami.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/1449579796.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/lemokufuwoke.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/xibazebilizok.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/38486008006.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/53931238208.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202194113143.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/75458919072.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/govuj.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/4112011764.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/vovifolimujala.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b36dece---piwanos.pdfIn PDF document text
    • http://findusafranchise.com/files/files/79804187388.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kuxupotuk.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/nitepigipokenowenoreji.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/gefezanozutigosed.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109191737392571.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/sunasepepofuwunidos.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/71263355782.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/85722450298.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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 17504 bytes
SHA-256: 103b197ec6841b76bbc2e3b1875f02ba4def19876a1bb5fd988d272f94cd84a9
font_01_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10700 bytes
SHA-256: f8fa62c5fea2fe39a9c15ba9661472c95f64059e2d8389d9075ffceb069ca0ad
font_02_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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