Malicious PDF — malware analysis report

Static analysis result for SHA-256 829719ead4fdfbd2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 23:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 006d379cb58c389f5faf147f01591438 SHA-1: 4a26d7637c89745fca4a9e188032b188cf4287b9 SHA-256: 829719ead4fdfbd252a17b8a270888f74c755a281ece7b17d1dea84eefcd3a9e
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 or trojan. It contains numerous embedded URLs pointing to distinct hosts, indicative of a link farm. One URL, 'http://archinfo.ru/uploads/file/sipiwafaregewesizetabadog.pdf', is directly associated with a heuristic indicating a link farm on disposable hosting. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://archinfo.ru/uploads/file/sipiwafaregewesizetabadog.pdf In PDF document text
    • http://sunnysolutions.it/uploads/assets/file/63630505914.pdfIn PDF document text
    • http://popmetre.com/news/files/70639174402.pdfIn PDF document text
    • http://air-ned.com/uploads/files/10137176330.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/nawadofipanimiboviro.pdfIn PDF document text
    • https://webrobogo.hu/kepek/xuxomowefazile.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/migokesizotefakan.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/jerasalirapevuvolilu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136067c8d384---kuxitepivaw.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zafeka.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/89912175772.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/gixuxuvatoxodotuza.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/disojugirugexagavukadozo.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/nozisobajoromevumozefom.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/fumokatabirugala.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zasenezufizozewegi.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/88406088950.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zokememadaf.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/77269292262.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/foxoguguxegom.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/8490863287.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/jafogoxotiz.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/18686058876.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/wimibomadugixodud.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/tadevowisisogejukeg.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/98084360323.pdfIn PDF document text
    • https://renewone.de/files/golusixanakebiruzedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=jurassic+world+download+hackPDF 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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 18500 bytes
SHA-256: 87fec02209bed73a12dc31c20c7d9cab16371c9dc4a1a606a4909168ec74c2d1
font_01_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 10508 bytes
SHA-256: 9e66bd4d3cd25267aaede2808debb3f4e41d4cd673d9f6bec3813f91fb4252d9