Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a6f54419c47131…

MALICIOUS

PDF

48.7 KB Created: 2020-03-25 04:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34ccea6bd9ba11f05ad253817e2621b6 SHA-1: 76d8833907c2e6f8e00a61a3ac363284da70b8e5 SHA-256: 39a6f54419c47131e8505c8ddebdb3a5bd76fb18bedcba8b7b95b719ed8bb3d9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains a URL that is also present in the list of external links. This suggests a link farm or SEO spam attack, where the primary goal is to drive traffic to other sites, potentially for malicious purposes or to improve search engine rankings for those sites.

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://ndtasanantonio.org/uploads/1/3/0/5/130550774/130550774.html#que+es+el+movimiento+de+precesion+de+los+equinoccios
    • http://mariannealeck.com/uploads/1/3/0/6/130604231/5809288.pdf
    • http://atouchofclaas.net/uploads/1/3/0/5/130551517/af3134f9c.pdf
    • http://mistershaky.com/uploads/1/3/0/3/130323425/bewutejonapa.pdf
    • http://autodiscover.cheerfullydani.com/uploads/1/3/0/5/130589243/7102602.pdf
    • http://fitnessbysteve.com/uploads/1/3/0/3/130379292/faxodov-tiwis-degikojokujekom.pdf
    • http://cpanel.karolinalux.com/uploads/1/3/0/6/130639976/9773953.pdf
    • http://landmarkrealtyva.com/uploads/1/3/0/7/130738928/jasobofevijewe.pdf
    • http://granvillewinery.com/uploads/1/3/0/5/130540155/kenajemokolatal.pdf
    • http://stillhopeforyou.com/uploads/1/3/0/6/130603937/662260.pdf
    • http://www.cloudfilemover.com/uploads/1/3/0/8/130814122/206e0fbc5.pdf
    • http://jeannettenobo.com/uploads/1/3/0/7/130776211/biguxupu.pdf
    • http://foodytees.com/uploads/1/3/0/6/130605178/eb732edd8f91.pdf
    • http://noclintonsnomore.com/uploads/1/3/0/4/130478067/3980287.pdf
    • http://srivisakaa.website/uploads/1/3/0/5/130588590/rizisogen.pdf
    • http://exceptionail.net/uploads/1/3/0/5/130544243/bc069f3.pdf
    • http://wallenderresidential.com/uploads/1/3/0/4/130483748/2865628.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_off00009123.bin
d18039876ddb5dfa98bdad5c508ffe2ceca3a7e6ce73ebf18ff8c489a068d59e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9123 9592 bytes

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