Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5be0f6f414c745…

MALICIOUS

PDF

71.6 KB Created: 2021-10-01 02:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae4a8cdb563379e98a1ac13a4848088c SHA-1: 7a619df281ed29ae0cd4fb6681911fb83936a9ff SHA-256: 1f5be0f6f414c745ecad487116798d2a49e26dfd1e6d6421e287208ccbfee858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the nature of the embedded URLs suggest an attempt to redirect users to malicious content or downloads, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://yyfxsw.com/upload/files/2018975966.pdf In PDF document text
    • http://tuderprogettazione.it/userfiles/files/76011331339.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/sozalevokadujalivarejud.pdfIn PDF document text
    • https://ptogel1.com/contents/files/23315758521.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/28311275461.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/fuziwikedefopafawepevin.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/86781406513.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/10196187445.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/30697212375.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/63598980693.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/235071589.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/jozomimudefitojav.pdfIn PDF document text
    • http://rapet.hu/files/zikitazived.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/56508918926.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/78340823537.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/86326843155.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/67014610033.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161424301d166f---dugevumutulil.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/vumiv.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/bumanakoromig.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/gowonaponineginikikimopu.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/8178149357.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ntqjqgtciu44ova5c3ud81rb23/gelebebeserek.pdfIn PDF document text
    • https://tpk-m.ru/files/file/jawadogemudizakigijuba.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/48920392497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+mario+bros+3+para+android+uptodownPDF 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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 11312 bytes
SHA-256: aaa30fb3acbd7d98917607888555a188fa6bb10e2e1ebe43adae81926a35a124
font_01_sfnt_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16784 bytes
SHA-256: b82c79a90a68cf26091d2d5869583e8e8272203495765ef6ad177045d277e45f

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