Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e61408be2a86eb…

MALICIOUS

PDF

90.2 KB Created: 2021-09-22 23:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44fe0b2f9caf160e62037cf7a6b760eb SHA-1: bcf86d1724288f88103f2fe8378c1ba73d36c61f SHA-256: 82e61408be2a86ebfb3b7b14e1fbeebe5673d095007ebed86c9c4940bff459df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which are part of a link farm on disposable hosting, suggests the document is designed to redirect users to potentially malicious websites. The document body is heavily obfuscated and appears to be generated content, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=mayweather+vs+paul+live+stream+free PDF link annotation
    • http://synerfreight.com/syner_upload/images/files/95887878801.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/72425712498.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/63880833311.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/xexitudeliwavakeviteja.pdfIn PDF document text
    • https://wildnaturetravel.com/File/mapavuk.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/jokifu.pdfIn PDF document text
    • https://trainova.com/userfiles/file/33951726247.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12953125941.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/42134347070.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/mokemotufapurugewar.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/kukegibedan.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/sujitirolaro.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/dogenopuxigilitebosakoba.pdfIn PDF document text
    • http://irollee.com/userfiles/file/solefufazuvegusideloreb.pdfIn PDF document text
    • http://www.77ice.com/upload/files/17645462511.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/8699369539.pdfIn PDF document text
    • http://amdind.com/userfiles/file/kugiforakegene.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/kazatojoxexidotekenaxira.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/1002609501.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/28559073596.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/65897884940.pdfIn PDF document text
    • http://186086.com/upload/files/34369246462.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/41125399299.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/zikox.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/pafadagogo.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_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 17992 bytes
SHA-256: 8b2a9beb4df6a0e698595363da393c3c17ff66d84f492c27a3a0962088dd0f07
font_02_sfnt_off0001420c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 10760 bytes
SHA-256: aba995c7dc30806c2e295421df9fa233ededa331c1add60ceb5b75eda96b1495

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