Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a34af77d77299a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 07:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abc7f9f963951e8754982ef26080f0a3 SHA-1: 6796c189f5dbb898c65ee84f93bc077858cd32b1 SHA-256: 23a34af77d77299acdd315c39d0c05bdab11f1ff1b6a3c14f468c34e3938cbdb
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 embedded URLs, with one prominent URL pointing to a site that appears to be a link farm or redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to distribute links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=missile+rpg+vip+mod+apk+unlimited+money PDF link annotation
    • http://ukrainski-rosyjski.pl/userfiles/file/lixelerinemawamubinutexu.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lafizosope.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/namosok.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/86773241406.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ff6f41f3---32743577969.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vabexaponepan.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/15951165276.pdfIn PDF document text
    • https://linardi.ru/files/file/34684454775.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210918070627.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/dajoli.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/333596457.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136760e7c0b7---8357745947.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/73124154301.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/172236022.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/zijosimepitomefum.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/pepomabajaromibu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/gafirol.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/56784343840.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/dugodapaginutupo.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/73805932050.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/50869571038.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/21523298921.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/konolizaretosidanu.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_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 11100 bytes
SHA-256: 2a2d9535c26d5fcbe1298874c77b3628792f77122531dd919102434127449a91
font_01_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16660 bytes
SHA-256: 251043ee33ba6618c251e0018996cd6890d3b2d5dee09f971f3830c02610603b

Open this report in the interactive analyzer, or submit your own file for analysis.