Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fbac7b6f018672…

MALICIOUS

PDF

43.8 KB Created: 2020-04-01 13:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c27f862632b45bfc401afa50e649f658 SHA-1: 84613e700c976375a3cdce7aea8172aa446a1f9c SHA-256: c5fbac7b6f018672e42f858d2c5139e10dea31c76fce7cc57a2bb1cd791e95b9
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, many of which point to other PDF files on different domains. This suggests a link farm or SEO poisoning tactic designed to drive traffic to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body content is largely obfuscated, making it difficult to determine a specific user-facing lure beyond the presence of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://christinabeautyparlour.com/uploads/1/3/0/4/130476506/130476506.html#tecnicas+de+conteo+combinaciones+y+permutaciones
    • http://senasationalcbd.com/uploads/1/3/0/6/130639059/d11738e0e3c.pdf
    • http://dallasyouthfitness.com/uploads/1/3/0/4/130483428/797a06fed26b.pdf
    • http://74-123-78-170.mgwnet.com/uploads/1/3/0/5/130551823/a4b29709ac9.pdf
    • http://reuseworkshop.com/uploads/1/3/0/6/130620928/nixavowumopu.pdf
    • http://menasmenagerie.com/uploads/1/3/0/5/130542865/pewavepojoj.pdf
    • http://buykaizensolutions.com/uploads/1/3/0/6/130621098/421927.pdf
    • http://leggendario.pl/uploads/1/3/0/6/130621525/sudogamesev_zisuwagewopux_wefuboxu_buvuvu.pdf
    • http://originaltravelspace.com/uploads/1/3/0/9/130969016/kiwasubadofe_dasig.pdf
    • http://fiveofive.shop/uploads/1/3/0/2/130288559/9653597.pdf
    • http://ecocupireland.com/uploads/1/3/0/6/130639611/taxukamasutif-birut-busuwavawakuwo.pdf
    • http://namakanka.com/uploads/1/3/0/7/130775011/kejoxepo_nuxipajovova_dokiwiseve_mumufa.pdf
    • http://mimoboutiqueperu.com/uploads/1/3/0/5/130545742/vosibuveten.pdf
    • http://cookingorsomethinglikeit.com/uploads/1/3/0/4/130488736/2991512.pdf
    • http://innerfitsolutionsgroup.com/uploads/1/3/0/6/130604434/murezowatoxoke.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_off000069ec.bin
10082e44597b5d93fdce935ee5fc99a989d0753898ffa16af3dc59f7f3ad0e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EC 9144 bytes
font_01_sfnt_off00008ac4.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC4 16036 bytes

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