Malicious PDF — malware analysis report

Static analysis result for SHA-256 0042fc60760757d1…

MALICIOUS

PDF

40.9 KB Created: 2020-04-03 18:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 755dc50bac01c2232449580666b6eb92 SHA-1: 0cea286963d62f6a211ce5b6460c33383bcd9cc3 SHA-256: 0042fc60760757d1337da0052e184c5b82dd221eed05ba0c796bc4a79c68604f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or content distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the primary malicious activity appears to be the mass distribution of links.

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://directroofrestoration.com/uploads/1/3/1/3/131379115/131379115.html#2007+yamaha+raptor+700+service+manual
    • http://bluesportsoutdoors.com/uploads/1/3/0/8/130873783/bitojedovo.pdf
    • http://paden.shop/uploads/1/3/0/6/130604803/tudisewigag-govetariri-wuruvij.pdf
    • http://sdasrescue.org/uploads/1/3/0/4/130436165/828127c5f71672.pdf
    • http://diamonds-straat.com/uploads/1/3/0/2/130289436/rodubome_doguxo_sulumama_fimaxeledodu.pdf
    • http://capitatime.com/uploads/1/3/0/5/130550885/247125ec5.pdf
    • http://verticallyltd.com/uploads/1/3/1/1/131164418/nulivoperil-zimugejusomovi-sofibipubopave-sabuxilezitew.pdf
    • http://resurfacetechnology.com/uploads/1/3/0/7/130738855/raxigezisogodo.pdf
    • http://papercraziness.com/uploads/1/3/1/3/131383841/cfe78787.pdf
    • http://conrpg.com/uploads/1/3/0/6/130620184/telaluna_votidulilejox_kadilidofozu_vegokigonenega.pdf
    • http://fightintheshade.net/uploads/1/3/0/3/130379365/285903e1ecf1362.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_off000077f3.bin
5c336a895531542afac31d5bb152723d5c30c8fa73307fcd4992f00bbb67754b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F3 8028 bytes

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