Malicious PDF — malware analysis report

Static analysis result for SHA-256 61dde2e694aed846…

MALICIOUS

PDF

47.3 KB Created: 2020-03-25 08:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 85b608b99a5bcf8dd8e92c4f9f6d1e0f SHA-1: 9de63858df80f14f0899cd79cfecf2ae1dc85d2c SHA-256: 61dde2e694aed846d93dffdee5d2b5985ddf618755329cc1b1ebc38f800b98a9
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 manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm. While no scripts were directly extracted, the presence of numerous URLs points towards a potential redirection or content-hosting attack, likely initiated via a spearphishing attachment.

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://darconstruction.net/uploads/1/3/0/2/130292110/130292110.html#relation+between+density+and+drift+velocity
    • http://www.middelfartskytteforening.com/uploads/1/3/0/9/130969840/datodofo.pdf
    • http://unholyspiritproductions.com/uploads/1/3/0/4/130488851/5541379.pdf
    • http://katkeep.com/uploads/1/3/0/5/130550956/860153.pdf
    • http://fantasianfantasticasian.com/uploads/1/3/0/5/130589147/wubotutomemew-mexajabakizat.pdf
    • http://yourxxtra.com/uploads/1/3/0/5/130588296/85def6fbc59.pdf
    • http://freeonlinereviews.com/uploads/1/3/0/4/130476152/6943258.pdf
    • http://corepeacedevelopment.com/uploads/1/3/0/7/130775521/vokelavibijot.pdf
    • http://thelocal-bigfork.com/uploads/1/3/0/5/130539108/9027557.pdf
    • http://valleyofthedunes.com/uploads/1/3/0/6/130605186/sigorubu.pdf
    • http://www.pioneerclaytargetclub.com/uploads/1/3/0/6/130604290/8226089.pdf
    • http://inspirations4u.net/uploads/1/3/0/3/130323697/kedawogonoz.pdf
    • http://casatavares.pt/uploads/1/3/0/6/130604732/buvem_pirotepulavumo_jitixatimoxezo_muwekemaxeb.pdf
    • http://totsthatrockllc.com/uploads/1/3/0/2/130272452/fatamab.pdf
    • http://pattyrovano.com/uploads/1/3/0/7/130775350/kugixutejoxebejara.pdf
    • http://topclasscreative.com/uploads/1/3/0/8/130813146/tapefonenafiwiwe.pdf
    • http://rocketrydb.net/uploads/1/3/0/5/130590108/5632235.pdf
    • http://centralvetemergency.com/uploads/1/3/0/5/130551089/d2e9a7c3f8367.pdf
    • http://pioneerbenefits.com/uploads/1/3/0/3/130313314/timumiralejade-tezulas-bizage.pdf
    • http://holidayfarms.org/uploads/1/3/0/7/130739495/2044050.pdf
    • http://www.crafttyrelmarket.com/uploads/1/3/0/7/130738978/ad0aafc4d68cf.pdf
    • http://poslovni-oglasnik.com.ba/uploads/1/3/0/7/130776265/ronejifakivil-zuwekexafin.pdf
    • http://myassetprotectionlawyers.com/uploads/1/3/0/5/130538953/fitemawosi.pdf
    • http://redspacestours.com/uploads/1/3/0/3/130313150/gunum_lebipaw_guwaxif_xujetexo.pdf
    • http://infraip.com/uploads/1/3/0/7/130740118/9698841.pdf
    • http://chicagosohohouse.com/uploads/1/3/0/5/130541465/20e218.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007abf.bin
3ff5c8cdf110b1b2e408dea5de015d7803e2da00b108aae7c2f6599577599c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 7944 bytes
font_01_sfnt_off0000999b.bin
287b852d1c1b0334c7d2ab49fe8ac8ac5488f6edefc3e00d5eee83c7048b9cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x999B 16088 bytes

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