Malicious PDF — malware analysis report

Static analysis result for SHA-256 a244427e3e75bb06…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 04:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 92c53596ddd60676dff81830e3e62b69 SHA-1: f1e4d22b47a3a5c82535576d002b0b2272522b2b SHA-256: a244427e3e75bb06f929d17dcce76b8a1232b33b391728bd8d995715d9f628b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with a notable URL being https://nomylo.ru/uplcv?utm_term=vat+calculator+apk. The document body was unreadable, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=vat+calculator+apk PDF link annotation
    • http://centreforeffectivecoaching.com/media/file/zazatosorugijago.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/43008902578.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/57285429543.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/67173966556.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/3479844608.pdfIn PDF document text
    • http://sarafis.pl/img/userfiles/file/85721676287.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/49376882692.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64855193095.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/66073149536.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/40857794794.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/gofakukamalek.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109121700497847.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/mafopibomikaporuka.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/19842743265.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/71148371069.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/22711222792.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/gosogugabumo.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/vexupeliru.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/piraju.pdfIn PDF document text
    • http://stefani.cz/fck/file/82875276598.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/tatukufowizobudol.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/81582569294.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dinedatitisozolawaxamatul.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909181151.pdfIn PDF document text
    • http://knipia.com/userfiles/file/59404506335.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/69771087957.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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 10032 bytes
SHA-256: bb1431a66f8842492b3a77ad4c38910092d665951f1bd38b6e0aa37911ff456b
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 17860 bytes
SHA-256: 35c7b96f85d2e29a58e09de963af174e5f2b5789c075ec98746704dc9ff3a53b
font_02_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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