Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0531df281372fbb…

MALICIOUS

PDF

56.6 KB Created: 2020-03-24 22:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: 94309e808257c0d299861caf5c58ff23 SHA-1: 426a6315c2bc5d6ad36002fc3ee575ab37322380 SHA-256: f0531df281372fbb62b6e5234b56178b780301ab746e27e83b3d9ebdedc7409c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected by ClamAV as Pdf.Dropper.Agent-9464747-0. It contains a large number of external links, many of which are dynamically generated and point to PDF files, indicating a link farm or SEO spam operation. The document body, though partially corrupted, contains a title related to primary school math, likely used as a lure. The primary attack pattern involves redirecting users to a network of malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-9464747-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9464747-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wwgoogetransport.com/uploads/1/3/0/4/130483697/130483697.html#sumas+llevando+2+de+primaria PDF link annotation
    • http://zotaknetworks.com/uploads/1/3/0/3/130380037/8784519.pdfIn PDF document text
    • http://aazraq.com/uploads/1/3/0/3/130312968/1462046.pdfIn PDF document text
    • http://nointernetweek.com/uploads/1/3/0/6/130603980/zomasovegiduf-buvigagedadusan-tagebiwox.pdfIn PDF document text
    • http://vivygirl-designs.com/uploads/1/3/0/4/130476216/tigogitupupu.pdfIn PDF document text
    • http://jinnyjoestudios.com/uploads/1/3/0/7/130738964/be8308390a8336.pdfIn PDF document text
    • http://missionmobilizationjonasmuyima.org/uploads/1/3/0/7/130738798/27919.pdfIn PDF document text
    • http://brownfencing.com/uploads/1/3/0/5/130590724/9442071.pdfIn PDF document text
    • http://idahononprofitservices.com/uploads/1/3/0/5/130589147/xigufe.pdfIn PDF document text
    • http://durgaconsulting.com/uploads/1/3/0/6/130620628/cdf913ef43d.pdfIn PDF document text
    • http://centerforpilates.com/uploads/1/3/0/6/130620873/zufepotudawejefi.pdfIn PDF document text
    • http://chadallers.com/uploads/1/3/0/8/130814728/tojapabufewevozivuzo.pdfIn PDF document text
    • http://konstrukcje-stalowe.com.pl/uploads/1/3/0/4/130491932/fejigejupesego.pdfIn PDF document text
    • http://customcomputer.shop/uploads/1/3/0/4/130478244/731740463133.pdfIn PDF document text
    • http://74-123-77-99.mgwnet.com/uploads/1/3/0/8/130874045/kigizemim.pdfIn PDF document text
    • http://christinawei.com/uploads/1/3/0/4/130483178/2882481.pdfIn PDF document text
    • http://kristianhricdesign.com/uploads/1/3/0/8/130873952/gugatigitiw_fowopofi.pdfIn PDF document text
    • http://hempoilsloutions.org/uploads/1/3/0/4/130475918/2239.pdfIn PDF document text
    • http://balaiodegarfos.com/uploads/1/3/0/6/130603853/fewomelozipusalavup.pdfIn PDF document text
    • http://citizens-medicare.com/uploads/1/3/0/6/130603861/gavinigad.pdfIn PDF document text
    • http://mrsseamonsclass.com/uploads/1/3/0/7/130775619/lurakokasumefujapi.pdfIn PDF document text
    • http://keanoscoffeeroasting.com/uploads/1/3/0/6/130639681/savozefalido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6F2 9292 bytes
SHA-256: 20702faa4ca83c37fe0db06f46fec126bc51c1e9f7259b10f897dcfceb8ecdff
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 2788 bytes
SHA-256: 985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6

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