Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b6979d04135768…

MALICIOUS

PDF

39.6 KB Created: 2020-03-09 05:38:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0824e2ca26aede4c470b7432038fe349 SHA-1: 2dfcc8bab55340073fe9231ee27e3f4337f654bc SHA-256: f6b6979d04135768a0c869c9395904673f16d0c0b96fe6688aa4cf939e2dc156
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on newly registered domains and appear to be part of a link farm. The primary lure seems to be 'Appsc junior lecturers mathematics previous question papers', directing users to a collection of PDF files. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs.

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://9i9n8.salon225.com/uploads/1/3/0/7/130740033/130740033.html#appsc+junior+lecturers+mathematics+previous+question+papers
    • http://fjbosworth.com/uploads/1/3/0/4/130483626/64fd0fe.pdf
    • http://advancedflies.com/uploads/1/3/0/4/130478163/fe095d8a.pdf
    • http://brazybraidz.com/uploads/1/3/0/5/130588984/jonejiwig-debuwunolux-bofodumaxukiw.pdf
    • http://808computertricks.com/uploads/1/3/0/6/130621219/tikex-vajekudaze-botuna.pdf
    • http://www.reliable-maids.com/uploads/1/3/0/6/130604696/deef2b88fd53112.pdf
    • http://tmitchellportfolio.com/uploads/1/3/0/4/130489342/eaf056.pdf
    • http://napolilotusfoundation.org/uploads/1/3/0/6/130639689/d1e7633dba70.pdf
    • http://mollymagdalain.com/uploads/1/3/0/5/130589429/24275.pdf
    • http://aquaponics-mart.com/uploads/1/3/0/4/130478551/somusubazedir_majepet_litijiwifusil_xiziv.pdf
    • http://oakgrovefarmstn.com/uploads/1/3/0/5/130550764/litasumoditexisirali.pdf
    • http://www.scottgpo.com/uploads/1/3/0/4/130476818/4e8110fd.pdf
    • http://rowanlestat.com/uploads/1/3/0/5/130539093/vubif.pdf
    • http://awesomeproductionsofficial.com/uploads/1/3/0/6/130603979/bfffb.pdf
    • http://virtotour.com/uploads/1/3/0/4/130476308/e61ccdba935b.pdf
    • http://74-123-79-49.mgwnet.com/uploads/1/3/0/2/130270903/navab-sofixefi-nobupigem.pdf
    • http://hostmaster.agefis.it/uploads/1/3/0/6/130620949/5b6e632.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e77.bin
553c4eb5f63f2b527997a818551a5aa014f6fe1866d5a4b212726b1ac3631e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E77 8288 bytes

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