Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8f0501435ca72a…

MALICIOUS

PDF

45.5 KB Created: 2020-04-09 20:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9c8090c0a7f4eca6b82e99b51f8238ec SHA-1: 2913960b07223eb30ec7fe1d7feb574e85947fd9 SHA-256: 5c8f0501435ca72a65a43357bda25911cf596a04acfe26b27ea50ac7bb12c007
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous external links suggests a potential for redirecting users to malicious sites.

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://xbosak.com/uploads/1/3/0/7/130775432/130775432.html#la+promenade+de+flaubert+tapuscrit
    • http://leapingpanther.com/uploads/1/3/0/2/130289247/591ca200d8e45f.pdf
    • http://3coconut.com/uploads/1/3/1/1/131164114/1dfd4e130.pdf
    • http://tegelbedrijfdejonghe.be/uploads/1/3/0/3/130324112/xugogezelije_tizovog.pdf
    • http://dgaudin.com/uploads/1/3/1/4/131454264/nobixirir-pogopo-rusex.pdf
    • http://gardenthymeacres.com/uploads/1/3/0/5/130544746/tipagazozo.pdf
    • http://theindependentassistant.com/uploads/1/3/0/6/130621626/8543799.pdf
    • http://discoveryoursenses7.com/uploads/1/3/0/7/130776878/napinugi_xivaweforez.pdf
    • http://skole.dk/uploads/1/3/0/9/130969871/1822499.pdf
    • http://clutchesbypat.com/uploads/1/3/0/8/130814992/vijetafotonuvu.pdf
    • http://heartlandbooks.us/uploads/1/3/0/4/130488312/1197662.pdf
    • http://amusethemeparks.com/uploads/1/3/1/3/131384166/2697927.pdf
    • http://btw-teruggave-zonnepanelen.nl/uploads/1/3/0/6/130621233/31fa994d.pdf
    • http://onemoment.co/uploads/1/3/0/8/130873932/xusevuwak.pdf
    • http://seezombiesrun.com/uploads/1/3/1/4/131453246/4508191.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007662.bin
0a5622789fcfd94de5eb370377d38673987cc2e3d5715b61fdcdc0d4f0f86cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7662 9168 bytes
font_01_sfnt_off000096b0.bin
34848fb7d14e1e562e9fa73ad7b6a4715c237742a31d43f776a93450974c19e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B0 4476 bytes

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