Malicious PDF — malware analysis report

Static analysis result for SHA-256 d166bb894a1e9120…

MALICIOUS

PDF

39.4 KB Created: 2020-03-07 14:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca149f6ef7bb0b26ca55a0a3ace55c2f SHA-1: e1763de99035b12e5cf78352b6a4c2e5494537fa SHA-256: d166bb894a1e91207e877c758a4b56b760a04ea44bec86d282fe6f088df2c209
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern appears to be directing users to a network of suspicious URLs.

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://adsl-64-169-66-165.millerpac.com/uploads/1/3/0/7/130775833/130775833.html#simon+sinek+leadership+and+being+a+leader
    • http://brownellguitars.com/uploads/1/3/0/2/130273872/7292447.pdf
    • http://www.prostatecurefoundation.com/uploads/1/3/0/6/130604779/c4cdbc6ec.pdf
    • http://hamptonvacationrentals.com/uploads/1/3/0/5/130590664/fca6815af075.pdf
    • http://wellosophy.com/uploads/1/3/0/3/130324248/kolidemejudamo_sekakedegi_vumewibepimoj.pdf
    • http://leasemyrv.com/uploads/1/3/0/5/130544321/nexerisawijoto_fenepufuvokofun.pdf
    • http://country-lane.net/uploads/1/3/0/8/130814176/5245439.pdf
    • http://getairpower.com/uploads/1/3/0/5/130588769/mafeget.pdf
    • http://mobileonegaming.com/uploads/1/3/0/6/130639358/vetefetuwukog.pdf
    • http://dirosastudiolegale.com/uploads/1/3/0/6/130604982/xavabejaxudun.pdf
    • http://redit-ma.com/uploads/1/3/0/7/130775702/da376fba22749e9.pdf
    • http://www.aniaoliviapr.com/uploads/1/3/0/6/130621946/2865893.pdf
    • http://www.roblesfamilyfarm.com/uploads/1/3/0/9/130969439/7492955.pdf
    • http://kartell.com.vn/uploads/1/3/0/4/130435661/d55ae88c.pdf
    • http://sensitivoantonio.it/uploads/1/3/0/7/130740130/6880501.pdf
    • http://colo9.mnemonix.com/uploads/1/3/0/7/130739348/8657888.pdf
    • http://de.banakelasi.be/uploads/1/3/0/9/130969026/ranavokafuribo-fejagegumewo.pdf
    • http://toalias.com/uploads/1/3/0/3/130323335/8ee6f.pdf
    • http://zonemaster.ongekendetalenten.nl/uploads/1/3/0/5/130550825/1730649808c8b5.pdf
    • http://webdisk.bassassassin.com/uploads/1/3/0/4/130436089/namejudoxux.pdf
    • http://chantellscloset.com/uploads/1/3/0/2/130270823/zuxijeme.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_off00007042.bin
e1168bf061f664228032678b2bf1943b21b1dbf6fb4836a044ed6016888ffdf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 7768 bytes