Malicious PDF — malware analysis report

Static analysis result for SHA-256 728670a3d184a1d4…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 04:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c6f1dbad0fce6161592dbe569dc3537 SHA-1: cd5e9f0433535d159f1047abbf01c83ff378878e SHA-256: 728670a3d184a1d444fd1e17266ddeb0790e4ae979ce72b63642cc1c724136c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=screen+record+with+sound+android PDF link annotation
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/nesafiwamogurepivedinizo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6fb47f303c50aa29f0e47794289d305e/87165139418.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/35506432989.pdfIn PDF document text
    • https://ibextrail.com/editor-images/mesowedasovugibedutoji.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/zasamun.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/76058082428.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/potoperoxen.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/bojarunipiposutabur.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109100400235627.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109090501554929.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/1133985243.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0c99fe2a48aeadf1eb06528b8984e6d1/58446892633.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/81819715034.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/17913488518.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/tebokafabedutasoxodis.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/81510610194.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/3858290352.pdfIn PDF document text
    • http://wdnederland.nl/file/sewitejuposituxipanumazir.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/zateberawij.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/22760357156.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/19319227408.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/rufadajagakikufoseve.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_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 18472 bytes
SHA-256: 74ec38e69f53158780c33a76724d018af995304fe48a7c3c066ca8d78fbfe562
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 10684 bytes
SHA-256: 273db8dc06788076d9dc4a294450a7b2ee1d70dee8b18846ac89c881357412c0

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