Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e731008c8dad43…

MALICIOUS

PDF

52.0 KB Created: 2020-03-25 06:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0eba68b3d861d08e1b1c071d3add7eef SHA-1: 98467d93fff3b28affe235078875f0c70cf73ad5 SHA-256: 59e731008c8dad43edf4ac0d247e4374f67e43ad7c6a42e8187e60a32224611c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various domains. This behavior is characteristic of a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern. No scripts were extracted, and the document body was heavily obfuscated.

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://matpoldachy.com/uploads/1/3/0/6/130603789/130603789.html#para+que+se+usa+el+jarro+de+aire
    • http://libraryjobsquad.org/uploads/1/3/0/5/130540540/rekinavil.pdf
    • http://luxuryapartmentvillars.com/uploads/1/3/0/4/130488700/c92543d.pdf
    • http://www.missclaudiajbailey.com/uploads/1/3/0/9/130969214/nowafiwobigoxewovij.pdf
    • http://swept-supplies.com/uploads/1/3/0/4/130483745/xazitu-tovitirenama-gelaxota.pdf
    • http://ayurvedayogainmind.com/uploads/1/3/0/2/130271232/datiteg.pdf
    • http://cchswritingcenter.org/uploads/1/3/0/4/130489627/somulazuwop-zikamodeno-raxezilutijafi-sijiju.pdf
    • http://bestmemoryfoamdogbeds.com/uploads/1/3/0/2/130289225/732dffc1c.pdf
    • http://sassediva.com/uploads/1/3/0/5/130588515/tizogolazibeto_zavusumipuvumib_pipot.pdf
    • http://vincentinbc.ca/uploads/1/3/0/9/130969552/farivo.pdf
    • http://onlinesound.com.au/uploads/1/3/0/8/130874403/motiwinetubepa.pdf
    • http://www.stephenhallmarimba.com/uploads/1/3/1/0/131070442/4585630.pdf
    • http://projectrita.com/uploads/1/3/0/6/130622049/jexavega.pdf
    • http://jimreese.us/uploads/1/3/0/5/130590592/2435948.pdf
    • http://songhurstexperiment.com/uploads/1/3/0/6/130604848/386d44ce6ef0ca.pdf
    • http://straightshooterrooter.com/uploads/1/3/0/2/130270834/4058660.pdf
    • http://sozolifecoach.com/uploads/1/3/0/5/130550833/5987563.pdf
    • http://www.acupuncturehilohawaii.com/uploads/1/3/0/7/130776356/f17f3.pdf
    • http://parkeringenuity.com/uploads/1/3/0/5/130538986/3417099.pdf
    • http://arlocksafe.com/uploads/1/3/0/5/130546283/gikoxogomidozesu.pdf
    • http://casenoibucuresti.com/uploads/1/3/0/7/130775762/wirowoz_motawenoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000806c.bin
173c44987d43b5c1db950c222ee7b49ddda848997729060fd12792b4a10dc5d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806C 9460 bytes
font_01_sfnt_off0000a2a9.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A9 2652 bytes
font_02_sfnt_off0000ac10.bin
2414d9de47835116e09a5c0f49320dbc7abc5a6ca738bd08cf85e4d577eb89a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC10 16228 bytes

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