Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a4c9a846899371…

MALICIOUS

PDF

37.4 KB Created: 2020-05-14 15:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 2aa7fe02ec65ea2aeeead58d1a50a6ec SHA-1: f70f4c67943adf4fd3be2c93664654558dab0776 SHA-256: 52a4c9a8468993713da6816d046d082c8b25f0d5a31a549f7dd7655da18cf7cd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious payloads, rather than providing direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://helpking.org/uploads/1/3/1/3/131383837/131383837.html#balangir+express+platform+number PDF link annotation
    • http://lewisbaymarine.com/uploads/1/3/0/6/130621532/rilotajuritut.pdfIn PDF document text
    • http://schultzsminiwarehouses.com/uploads/1/3/0/6/130604222/kabanapixe.pdfIn PDF document text
    • http://hiddenriverwholesale.com/uploads/1/3/0/8/130813648/runaxikodakatomet.pdfIn PDF document text
    • http://almostarthistory.com/uploads/1/3/0/5/130539297/2053318.pdfIn PDF document text
    • http://timception.com/uploads/1/3/0/3/130379351/8338554.pdfIn PDF document text
    • http://arttherapysanantonio.com/uploads/1/3/0/2/130272477/dejejivoxados.pdfIn PDF document text
    • http://saintclairstorage.com/uploads/1/3/0/7/130739405/0e5d56db.pdfIn PDF document text
    • http://missybs.com/uploads/1/3/0/7/130776169/riwip.pdfIn PDF document text
    • http://judahglobalsolutions.com/uploads/1/3/0/3/130323295/6993293.pdfIn PDF document text
    • http://roxistudios.com/uploads/1/3/1/4/131411197/0415f3fa76b1d.pdfIn PDF document text
    • http://lushlife.shop/uploads/1/3/1/8/131857241/dudumidefe-rinitojalabe.pdfIn PDF document text
    • http://millennialtravelagentforum.com/uploads/1/3/0/3/130379298/wurupa.pdfIn PDF document text
    • http://betterby10.com/uploads/1/3/0/7/130739945/4600f29ac1f766.pdfIn PDF document text
    • http://so-heavy.com/uploads/1/3/1/4/131409385/4746622.pdfIn PDF document text
    • http://serenityautomationservice.ca/uploads/1/3/0/7/130775275/f145ebcac77d7a.pdfIn PDF document text
    • http://m2enterprises.org/uploads/1/3/1/4/131453485/girafiko.pdfIn PDF document text
    • http://myecoflipp.com/uploads/1/3/0/5/130588710/xodutitusa-memimewal-fesebonubo.pdfIn PDF document text
    • http://annibergmanparentinfantprogram.com/uploads/1/3/0/6/130621496/1357942.pdfIn PDF document text
    • http://intertito.be/uploads/1/3/0/5/130546118/kumekekewirepoma.pdfIn PDF document text
    • http://valleyrage.com/uploads/1/3/0/8/130814193/xivimekolikujon-goguva-rigekejovajaz-wudakerowogin.pdfIn PDF document text
    • http://terisherbs.com/uploads/1/3/0/7/130775106/c8212.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 10520 bytes
SHA-256: 90507f976550e9612c72aee5366c232d71f79c0a3839f715264da0bacc467cc1

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