Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb91515332cfedc…

MALICIOUS

PDF

34.4 KB Created: 2020-05-30 23:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a4864d91b86fa7d5512ce0ce5c2cac SHA-1: 7168652d079818da08fe5dbbe6944190fa84e88a SHA-256: 8cb91515332cfedc2f3dbb552e084a99bf2e8a2198d8cb315be429b1bd167c32
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.003 Phishing: Spearphishing Attachment

The sample is a small PDF containing a high density of external links to various unrelated domains, triggering the PDF_SEO_LINK_FARM heuristic. The document body contains a lure related to 'Jean piaget bili_sel geli_im kuram1', suggesting it is designed to attract search engine traffic for specific academic keywords. No scripts were extracted from this sample, but the high volume of external redirects is characteristic of SEO poisoning campaigns.

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://stthomastheapostletrack.com/uploads/1/3/1/4/131407143/131407143.html#jean+piaget+bili%25C5%259Fsel+geli%25C5%259Fim+kuram%25C4%25B1
    • http://eliteprolinguists.com/uploads/1/3/0/4/130435682/bab088.pdf
    • http://surgerysteps.com/uploads/1/3/0/3/130324164/2d48d7a4619b40.pdf
    • http://lisacushman.com/uploads/1/3/0/5/130589231/bf62d4b64b90510.pdf
    • http://claytonstreetguesthouse.com/uploads/1/3/0/7/130739508/4195365.pdf
    • http://michaudtyler.com/uploads/1/3/0/6/130605203/mobipepuwup.pdf
    • http://titanbrass.com/uploads/1/3/0/5/130539818/megarige_luwebekejad.pdf
    • http://iamthaicuisinemi.com/uploads/1/3/0/6/130621831/remiw-zuribebage.pdf
    • http://nurturingbabies.net/uploads/1/3/0/6/130605075/4290541.pdf
    • http://beastpunks.com/uploads/1/3/0/4/130483248/1281374.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_off00005a70.bin
971ac742449d7d43d7cab94a27ecab454e5a8930f23401fe49a8bfe76a5852dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A70 10532 bytes

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