Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0481f432f7181a…

MALICIOUS

PDF

39.8 KB Created: 2020-03-29 23:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 49fdff147782f9f5050148fb6f97566c SHA-1: c53937a6ce4a70999b4a12dede719df8ccba0d53 SHA-256: 5b0481f432f7181a992dc729ab0369106e8abb7da8dbc1a80687aed8ff975101
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a high likelihood of malicious intent. The document body contains a seemingly unrelated title about a submarine periscope, likely a lure to disguise the malicious nature of the embedded links.

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/1/3/0/6/130639504/130639504.html#para+que+sirve+un+periscopio+de+un+submarino
    • http://madelineliao.com/uploads/1/3/0/9/130969001/zoforakodew.pdf
    • http://bysphotobooth.com/uploads/1/3/0/4/130436154/nasiloxosebo.pdf
    • http://dltpress.com/uploads/1/3/1/0/131070579/96d4da.pdf
    • http://demoforalisonmiller.com/uploads/1/3/0/2/130287873/34c866.pdf
    • http://www.enscarved.com/uploads/1/3/0/8/130873853/3617659.pdf
    • http://uxpuli.com/uploads/1/3/0/7/130775596/zojupek_rarof.pdf
    • http://equinebreedingservice.com/uploads/1/3/1/3/131398334/9202213.pdf
    • http://avolie.com/uploads/1/3/0/3/130323184/042926ae54f67f.pdf
    • http://addictedtoaspen.com/uploads/1/3/0/2/130271054/sorizelelij.pdf
    • http://underthedryer.com/uploads/1/3/0/2/130272979/patopixososexa_joviwudox_suvowemazupuz_mifaner.pdf
    • http://chrismouch.com/uploads/1/3/1/1/131163643/7665068.pdf
    • http://cobaltconstructiontx.net/uploads/1/3/0/3/130313159/81ca53c68e7.pdf
    • http://schneider-math.com/uploads/1/3/0/7/130738845/gudod.pdf
    • http://takanomarketing.com/uploads/1/3/0/6/130603810/4353887.pdf
    • http://sameh-abdelaal.com/uploads/1/3/0/7/130775808/mekefokikap-jonodi-donejuz-volujitujoje.pdf
    • http://bigturnasia.com/uploads/1/3/0/8/130874645/5306769.pdf
    • http://hoosierfavorites.com/uploads/1/3/0/4/130489152/5791437.pdf
    • http://sno-ops.org/uploads/1/3/0/6/130605078/kesarabibesufix.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_off0000700e.bin
35fb25cb3697a56a727b5ea0c3b036129b0f63a43b88a0e742c53e9805e240f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700E 8780 bytes

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