Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b9e86e4a05e08…

MALICIOUS

PDF

54.7 KB Created: 2020-03-29 09:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 6dbb413bb56e461b63ba9ef89549ea1d SHA-1: d60c00839b9e5f1ba67fe355894aab13f10c5dde SHA-256: 798b9e86e4a05e084f189bb9d2d1b4c108b1f04e7ca4570b04d365722c8a8232
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though partially corrupted, also contains one of these URLs. This suggests a link farm or redirection scheme designed to lead users to a multitude of external resources, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample.

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://7levelselling.stefanaarnio.com/uploads/1/3/0/8/130874066/130874066.html#ejemplos+de+comunicaci%C3%B3n+verbal+en+ingl%C3%A9s PDF link annotation
    • http://oaklandcommunitycouncil.org/uploads/1/3/0/2/130289636/6507004.pdfIn PDF document text
    • http://kimistryrose.com/uploads/1/3/0/8/130874583/finuduronek.pdfIn PDF document text
    • http://www.catjajohansson.dk/uploads/1/3/0/9/130969681/mokubejowun.pdfIn PDF document text
    • http://ecotots.ie/uploads/1/3/0/4/130435734/c6be1.pdfIn PDF document text
    • http://wepaintct.com/uploads/1/3/0/7/130739662/girimo.pdfIn PDF document text
    • http://www.rockshaaft.com/uploads/1/3/0/5/130588457/91495ca32.pdfIn PDF document text
    • http://racebaseuk.com/uploads/1/3/0/4/130488158/70031ab46b2bfd.pdfIn PDF document text
    • http://reconciliarte.org/uploads/1/3/0/4/130476743/0028d360fd.pdfIn PDF document text
    • http://animenewsnetwork.org/uploads/1/3/0/5/130550969/gajukilojalerorubu.pdfIn PDF document text
    • http://hostmaster.sallycathcart.org/uploads/1/3/0/7/130775220/27202.pdfIn PDF document text
    • http://thaddeusnhizfamily.com/uploads/1/3/0/7/130776499/e5f76.pdfIn PDF document text
    • http://dorsetheartdoctor.com/uploads/1/3/0/7/130739261/9601938.pdfIn PDF document text
    • http://regaliaforhope.com/uploads/1/3/0/4/130490218/wujad.pdfIn PDF document text
    • http://gelatotroppobuono.net/uploads/1/3/0/6/130639203/fuwasamerak.pdfIn PDF document text
    • http://poerecords.net/uploads/1/3/0/7/130775641/7795253.pdfIn PDF document text
    • http://thoughtandbelief.com/uploads/1/3/0/5/130590435/7094356.pdfIn PDF document text
    • http://mansester.com/uploads/1/3/0/7/130740044/kazalijolizag.pdfIn PDF document text
    • http://mta-sts.alessandrobrighetti.com/uploads/1/3/0/9/130969868/bomuwifejexisali.pdfIn PDF document text
    • http://vulcanonline.org/uploads/1/3/0/3/130379158/019d6def6.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

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_off000090e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E0 9576 bytes
SHA-256: 328eaf7de62dc1aaf0a5d3a26d737efaef0bb183d3ca717dec5e05d5498543a3
font_01_sfnt_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 16576 bytes
SHA-256: ad219f6d8f84f4d63173db6297d9dde79704f5143808ffe5d79fed491746633e

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