Malicious PDF — malware analysis report

Static analysis result for SHA-256 61288b96bd4cc06b…

MALICIOUS

PDF

46.5 KB Created: 2020-04-01 22:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b634c6a29782431b395356fe497d17c2 SHA-1: 7933daa20bc7b33f48e215dcba333040643e24ed SHA-256: 61288b96bd4cc06b6a4a05f2d24d572211633e07b8e212d56a4e5793b92cac51
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links to other PDF files across numerous domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be the distribution of a large number of linked documents, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

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://cbdirect.biz/uploads/1/3/1/3/131398498/131398498.html#list+of+chan+boards
    • http://allanglespainting.net/uploads/1/3/0/2/130270738/4244624.pdf
    • http://garagedoorrepair-agourahills-ca.com/uploads/1/3/1/4/131483348/9954aae10.pdf
    • http://anesaspeaks.com/uploads/1/3/0/7/130740180/rukipupogab.pdf
    • http://www.blueskyalc.org/uploads/1/3/0/8/130874586/tobopunipow.pdf
    • http://gmestemps.com/uploads/1/3/0/2/130271250/dce2f7bd.pdf
    • http://hostmaster.zoza.co.uk/uploads/1/3/1/4/131437623/1d54b2d.pdf
    • http://fauziah-permatasari.com/uploads/1/3/0/4/130476143/nipexafirid_gesuves.pdf
    • http://montyscafe.com/uploads/1/3/0/6/130620395/2766475.pdf
    • http://kcadventures.net/uploads/1/3/0/7/130776026/69547feb6cb1de.pdf
    • http://j-bar-n.com/uploads/1/3/0/6/130639744/9390f6ac2.pdf
    • http://holisticallyhoned.com/uploads/1/3/0/2/130287847/9753ed.pdf
    • http://armidalemintodental.com/uploads/1/3/0/5/130539714/dinew_dumugolafesobo_mijowoxerekali.pdf
    • http://bachfloweressentials.com/uploads/1/3/0/3/130323249/femipodiv.pdf
    • http://templebethmoshe.com/uploads/1/3/1/0/131069950/gajatuz.pdf
    • http://thesaltedearth.org/uploads/1/3/1/3/131398215/xadetepu_wizag.pdf
    • http://thewritershighretreat.com/uploads/1/3/0/5/130550749/2091838.pdf
    • http://theoperaexperience.com/uploads/1/3/0/5/130540209/wumatumaw.pdf
    • http://580washingtonstreet1503.com/uploads/1/3/0/5/130590392/wotutesur-sizuvi-vuvisu-kedaduwo.pdf
    • http://kirkbates.com/uploads/1/3/0/2/130270989/jiluri.pdf
    • http://maritime-economics.com/uploads/1/3/0/5/130588656/1547413.pdf
    • http://florajamesphotography.com/uploads/1/3/1/4/131406433/nenotofiribi.pdf
    • http://gemscheerwoodstock.com/uploads/1/3/0/5/130543373/4498987.pdf
    • http://tzivelek.com/uploads/1/3/0/6/130639462/purovomazadomunoluta.pdf
    • http://moikaitrading.com/uploads/1/3/1/1/131164205/b97e5486.pdf
    • http://andreiagutierrez.com/uploads/1/3/0/6/130620640/2e7e309dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000818b.bin
45adc15eb61d6d1ae37df2269c6fb96ef0665c81401f093150fbc7d7c4e3082a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818B 8348 bytes
font_01_sfnt_off0000a1b3.bin
f6e07d723c6f40ddb785863132f1a0efa049bd9f605eb3249652b6e99e047ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B3 2868 bytes

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