Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b7dd0c2a8b6e8e…

MALICIOUS

PDF

36.7 KB Created: 2020-04-05 04:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f31b404dfd8b8f8d8e4fa109a4d15cce SHA-1: bc440e1be4e5196aea17b8c4e7be056fb60d42d1 SHA-256: 04b7dd0c2a8b6e8e296aa2c62ec9bba3adca03adcd1e18694ab117dd35f3c88a
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, identified as a PDF link farm. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a tactic to manipulate search engine results or distribute additional malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://insiot.org/uploads/1/3/0/8/130873954/130873954.html#fes+aragon+horarios+2020-2
    • http://northcanterbury.properties/uploads/1/3/0/6/130604988/3079293.pdf
    • http://simplymeboutiqueiowa.com/uploads/1/3/0/7/130775471/zapijapuxaneko.pdf
    • http://sunfloweressentials.com/uploads/1/3/0/6/130603942/3206793.pdf
    • http://burlingtonrenos.com/uploads/1/3/0/7/130740169/663050.pdf
    • http://pinksticker.com/uploads/1/3/0/7/130738778/7203100.pdf
    • http://hamandhistoire.com/uploads/1/3/1/4/131406802/2320748.pdf
    • http://salmonguitarschool.com/uploads/1/3/0/5/130547418/6856240.pdf
    • http://mox-vr.com/uploads/1/3/0/4/130476378/jaratuweziterudo.pdf
    • http://quantumpropertyrealty.com/uploads/1/3/0/4/130476417/3dfca44.pdf
    • http://almacardenasbrothersaginc.com/uploads/1/3/0/6/130621905/1242701.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_off00006377.bin
f908504c03d57b99531404a50dc4b337bdf234c2c75ed84e86d2224d7414a23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6377 9016 bytes

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