Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7f510859358a37…

MALICIOUS

PDF

39.3 KB Created: 2020-05-17 12:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 70401f789fd89ac055937e93d944cd71 SHA-1: 79bd5a83d51a1c9d1e87197f361a25607df54ac8 SHA-256: 9a7f510859358a37e195ae6a65162c84e4dbb3de33aa73a28212dfe1d6e75acc
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a mass of external links. The document body, though partially corrupted, contains references to 'catchphrase answers episode 4' and metadata from 'wkhtmltopdf', which are likely decoys. The primary malicious activity appears to be directing users to a wide array of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zambiasafarihunting.com/uploads/1/3/0/2/130272470/130272470.html#catchphrase+answers+episode+4 PDF link annotation
    • http://kgcllc1.com/uploads/1/3/0/6/130620427/66ccdc361a03.pdfIn PDF document text
    • http://clarafine.com/uploads/1/3/0/5/130539446/6f07287e31ec.pdfIn PDF document text
    • http://allbigskyrealestate.com/uploads/1/3/0/7/130775797/xakejaxi.pdfIn PDF document text
    • http://twbmotors.com/uploads/1/3/0/4/130488779/zewizedojokuri.pdfIn PDF document text
    • http://residentsoftheuniverse.com/uploads/1/3/1/6/131607445/be15718dcb68.pdfIn PDF document text
    • http://theservantmessengers.com/uploads/1/3/1/3/131380470/tewosilivudukuz.pdfIn PDF document text
    • http://andrewlaskowski.net/uploads/1/3/0/4/130489371/1cf24d.pdfIn PDF document text
    • http://documenteddouche.com/uploads/1/3/0/6/130603715/bunatowekiboguw.pdfIn PDF document text
    • http://shroudsoft.com/uploads/1/3/1/3/131383921/4665337.pdfIn PDF document text
    • http://sarmiento-merchandise.net/uploads/1/3/0/4/130488662/121026.pdfIn PDF document text
    • http://preventativeedge.com/uploads/1/3/1/1/131164079/3d9224c95.pdfIn PDF document text
    • http://stacialevy.studio/uploads/1/3/0/7/130775456/gonoj_fozazujag_wumosaza.pdfIn PDF document text
    • http://rnbrief.org/uploads/1/3/0/8/130814076/daa015dc0d18c4.pdfIn PDF document text
    • http://cafe3am.com/uploads/1/3/1/3/131383761/budefigomude.pdfIn PDF document text
    • http://alyssavegerphotography.com/uploads/1/3/1/4/131452886/3519277.pdfIn PDF document text
    • http://coastalband.org/uploads/1/3/0/6/130639456/binuperogimun.pdfIn PDF document text
    • http://solferinorganico.com/uploads/1/3/0/7/130738963/vusuzulexuvoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1B 10496 bytes
SHA-256: df705ba4988d98a1f0fb29ee305faab6f43ec424599d6edb441b6fdbd0f37e77

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