Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc0848cd634095…

MALICIOUS

PDF

42.8 KB Created: 2020-04-02 12:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dbac5ec746f758758699dcfe9714df0e SHA-1: cb4f2d6b6bc8d0ea03917909f315e2e58d494194 SHA-256: 39cc0848cd6340955951d89b46c7f472b3fa4bc11540a592bb46993c3b37f385
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains the phrase 'Prueba de psicologia hombre bajo la lluvia' and references 'wkhtmltopdf', indicating a lure to a psychology test hosted on external domains. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://vintageslim.com/uploads/1/3/0/5/130539344/130539344.html#prueba+de+psicologia+hombre+bajo+la+lluvia
    • http://alexpepstein.com/uploads/1/3/0/7/130776755/7629551.pdf
    • http://marianbelgray.com/uploads/1/3/0/5/130550782/c23e9f289b8fa5.pdf
    • http://oakvilleklosterschule.com/uploads/1/3/0/6/130639471/bipoxaniwirimib.pdf
    • http://jenmalibu.com/uploads/1/3/0/2/130289453/nojotam.pdf
    • http://obidistributors.com/uploads/1/3/0/6/130620839/teravuxidanet.pdf
    • http://nomadicescaperoom.com/uploads/1/3/0/3/130313445/7f1524f3e2.pdf
    • http://mylocalpayroll.com/uploads/1/3/1/4/131413603/vonewixo_kajiridub_sopil.pdf
    • http://winxkid.com/uploads/1/3/1/4/131437106/603320.pdf
    • http://thepaisleyroseflowers.com/uploads/1/3/0/7/130739864/digafiralesud.pdf
    • http://jaswebsite.com/uploads/1/3/0/7/130775104/b7133a44363.pdf
    • http://conventusmedia.net/uploads/1/3/0/3/130324227/18bb71fed.pdf
    • http://dana-bruton.com/uploads/1/3/0/3/130324370/vulisitabilugu_nutozezekudonu.pdf
    • http://imageenhancementstudio.com/uploads/1/3/0/4/130478520/7fd1afb.pdf
    • http://pofvcall.com/uploads/1/3/0/5/130540700/kobenilo.pdf
    • http://nurtureunow.com/uploads/1/3/0/6/130621477/5036696.pdf
    • http://mariamarkos.com/uploads/1/3/1/0/131070166/9489624.pdf
    • http://e-classrings.com/uploads/1/3/1/1/131163538/jebepefasaniji.pdf
    • http://thesimplifiedlife.net/uploads/1/3/0/9/130969032/471492.pdf
    • http://maysmemories.com/uploads/1/3/0/7/130740376/c1da2.pdf
    • http://expressivelanguages.com/uploads/1/3/0/8/130874394/fapabirolujowi-xifegirop-pimejivekod-lirodul.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_off00007cdb.bin
7007be8eca38d318264fa9c3a17e1f39491cf49ed0e34cc3f337a586989e6454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDB 8472 bytes

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