Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ec4ba58eb5f817…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 11:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0aa1d55be1825f9f37203a6cea84451 SHA-1: 9e629e5fa3f59f32b177ef25fad21ac0a8a3c8cf SHA-256: 60ec4ba58eb5f817f6f25464370bea8e1e3d9b2fad4eb133afe8054c1ae745c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=words+that+end+in+oo+sound PDF link annotation
    • http://wabasnb.com/files/fckeditor/file/16390719016133cf710f98a.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/luvipanovur.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jinevani.pdfIn PDF document text
    • https://sharenkon.com/files/83299693824.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/sesisufixozewabutave.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fafab049c80868b21a8a37190101cb99/17142872191.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/79001323552.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///kiwitutopukisitifa.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/12275577317.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/gebirikofunenubujatofose.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/43434969825.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/bivogigoni.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///67861238132.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/52780064061.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/22428010641.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/fakijanaduraje.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/33656964807.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/lejopidime.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/barivarikakavip.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/130938035396.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/savawiji.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/vopovumiziloxowote.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/tawudubugim.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/23745164266.pdfIn PDF document text
    • http://splogservice.ru/content/files/vekokigogadodu.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 18908 bytes
SHA-256: d2d88b70f3add95f94aa0c8ecc3aa1c7961016474c9b398929715957e06e5bc8
font_02_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 10392 bytes
SHA-256: d1130528cb131f0b8e9272604ba2d9d02f7ec33226b59b63bb2e3599011201de

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