Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1d8e3cc0b5a61a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 08:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a024e555084096ece7114c4674c26f47 SHA-1: 70c67f957355442c9cd74d617b31ed2690b048bb SHA-256: 1f1d8e3cc0b5a61a8d5481e949402e4d1d9051185353a0c40b8122469b29229c
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 high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=where+can+i+watch+the+hate+u+give PDF link annotation
    • https://barcelonamedicalcenter.com/files/galeria/files/57360429113.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/39994161643.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/gonezepogazul.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/19357637456.pdfIn PDF document text
    • http://tcihk.com/userfiles/30204617328.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/basorunutajazusuneju.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/sogokajejos.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/gifokoxuno.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/91165516431.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/47183418376.pdfIn PDF document text
    • http://inphilong.com/upload/files/salinezik.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/mapusevumotuxilokowiku.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/91950417400.pdfIn PDF document text
    • http://zerosquareonline.com/file/nesixaxal.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/budosudubakutifurovax.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fff44b5728a545cfcd2948aaea7e0221/93808626749.pdfIn PDF document text
    • http://ceroki.com/image/files/41244077409.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/37419795025.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/sovarapunimatedewabit.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/zakarulufetopo.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/zozosokox.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/8503634326.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/80597792075.pdfIn PDF document text
    • http://etkenkalip.com/files/3119227491.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/66838555068.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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 10420 bytes
SHA-256: 97865f4f388497a1cdff89d07909d8cc36ee3962bf71f266ec7034dd1c68d64b
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 18716 bytes
SHA-256: ea15e78a22d88e276231d2c64b51f3b48e20a5ddb7fea2defb4066faef5ae528

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