Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eda4aaac6f7308…

MALICIOUS

PDF

38.8 KB Created: 2020-04-07 23:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15b0bad3ba7e44798f56d23821526777 SHA-1: 97b284a936e65ae8035f9d8f499b2c734ed58658 SHA-256: c4eda4aaac6f73084f3eedc4cbd8e0c31bef89453e114fbc8f7d6944c1f53f0f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of an attack.

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://pranzotruck.com/uploads/1/3/0/7/130775974/130775974.html#quadro+2000+driver
    • http://futureteachersteph.com/uploads/1/3/0/5/130588518/gazebuwa.pdf
    • http://hempdreamweaver.com/uploads/1/3/0/5/130550698/3ae8deb0b8cd.pdf
    • http://blackchevy.shop/uploads/1/3/0/5/130538956/9645392.pdf
    • http://beijingpost.org/uploads/1/3/0/5/130541552/guretumapogo.pdf
    • http://a2sainspectors.com/uploads/1/3/0/6/130621610/remuloviweji-nuxabiz.pdf
    • http://ctrplumbingllc.com/uploads/1/3/0/5/130590243/posewax.pdf
    • http://aligninsuranceservices.com/uploads/1/3/0/7/130775951/xifeg.pdf
    • http://organiccannabitches.com/uploads/1/3/0/9/130969062/728529172.pdf
    • http://adamstavely.com/uploads/1/3/0/7/130776891/goledigu.pdf
    • http://westcoaststarsbu.com/uploads/1/3/0/5/130550992/sebojezofep.pdf
    • http://mkfmetals.net/uploads/1/3/0/5/130590076/tamuzobiterulewutol.pdf
    • http://100percentmaintenance.com/uploads/1/3/0/4/130436080/pogozegif.pdf
    • http://primarytackle.com/uploads/1/3/0/5/130539297/leranubekifafebupa.pdf
    • http://sheismommy.com/uploads/1/3/1/4/131413040/pinodezopa.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_off00007103.bin
cb3425248ea85c8dfa1c4090f87b891e5bcb57b8106076b37c126f1d0af21a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 7592 bytes

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