Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ce0958a1ece80f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-29 02:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2475a8e24641676a0366d8a59a816cc6 SHA-1: f6679cadcc2482b8b90828cd5e2ab2819ddc221c SHA-256: 78ce0958a1ece80f25e0400e12a0adc9da01e230d7f3337c2ef0c1bc14c39b0f
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, pointing to numerous distinct hosts, which is a common tactic for distributing malicious content or conducting phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://opescom-store.com/uploads/FCK_files/file/39685250703.pdf In PDF document text
    • http://fluitec.fr/ressource/site-image/files/lupumuwexuxonusur.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/1868513220.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/59f162d22718d5b8563819a83dbbec57/38561260055.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/nodomubufamewaramimimo.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/25878402697.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/givomotadasasiwanerexeja.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/58781585078.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/jerikovam.pdfIn PDF document text
    • http://dasbluemchen.com/zokiro.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/19591711470.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/38028766464.pdfIn PDF document text
    • http://feminella.ro/upload/fck/pubopex.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/xowufajuf.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/8537048780.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/29948540209.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jirupotivevun.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/fexaruxetinosunopa.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/gewas.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/96810134611.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/tukirurijunopesurobubo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/46455608856.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/pewunuzolizasojopewi.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/89127256666.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7fb9725f26e553572e5a7ad7c53aa792/pikusujefumate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=love+and+basketball+123moviesPDF 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 18124 bytes
SHA-256: ad1b3bdb43f16b7c7b17adef4b99d26e1f9f00f28728cd359a72eabd444ab6f5
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 10908 bytes
SHA-256: 529ae4064ae8bee35ed5d5e329328ac274b131a7ff63c96c9eeee0efb973a354
font_02_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1