Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c37f3ce3c12719…

MALICIOUS

PDF

77.3 KB Created: 2021-02-14 20:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2bb4df36fb938e58098c02e9bab76630 SHA-1: dc8ea3231c42bde37d19fcbbdda7379002b5210c SHA-256: a8c37f3ce3c127194617cc76b384eee2d6dcb21e689574d0121a562b616754be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL points to a domain associated with potentially malicious content, while other linked PDFs are hosted on cloud storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=ceh+certified+ethical+hacker+pdf PDF link annotation
    • http://richteam.site/xixukuvajctlj7.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/jerumajixoronapuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_601ace96d0310.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/9225018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_601f6cc09c496.pdfIn PDF document text
    • https://jopokoguse.weebly.com/uploads/1/3/0/8/130874396/dowetedebig_jujobowi.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/gigib-patukad-novaz.pdfIn PDF document text
    • http://itanto.space/47918712833z72iz.pdfIn PDF document text
    • http://xplaintome.ru/rezixobefapiweminudupeg3n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lixuzo/uncle_ato_dzi_dew_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/microsoft_access_computer_inventory_template.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/45371369819.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/palimof.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 4724 bytes
SHA-256: 16429f377203ecaafd2bc7e812016447e2895e68a9434d691a4dcc6e8dbbc032
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 14288 bytes
SHA-256: 54dce3354e20965023608aaeb7fc87cfabe934a8b66d01161ad6b2d25ed4baad
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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