Malicious PDF — malware analysis report

Static analysis result for SHA-256 1578c652b1a90fe6…

MALICIOUS

PDF

47.5 KB Created: 2020-03-14 17:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 13425b5e276144850f88577ca36f1ddb SHA-1: 78d77c57f5644740d55f34a575ff9d8fb06b1889 SHA-256: 1578c652b1a90fe684fc979978d815ab1422d6a954a001135c9e7a39e7432d23
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users searching for Google Sheets functionality. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a link farm points towards a malicious intent to redirect users to potentially harmful 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://host80.carmichaelnl.com/uploads/1/3/0/7/130774964/130774964.html#google+sheets+compare+two+columns+conditional+formatting
    • http://kamconsulting.fr/uploads/1/3/0/7/130776341/3105448.pdf
    • http://1333nkingsbury.com/uploads/1/3/0/5/130540401/dibotuvejufo.pdf
    • http://www.joyful-kidz.com/uploads/1/3/0/2/130271195/kuxiwivis.pdf
    • http://belleandmac.com/uploads/1/3/0/8/130874347/fusiwurupevo-vemibenizoz-fixad.pdf
    • http://genessolutions.com/uploads/1/3/0/6/130639856/remorut.pdf
    • http://elkbuskencuentra.com/uploads/1/3/0/5/130540172/583938.pdf
    • http://www.marcusreesroberts.com/uploads/1/3/0/7/130775180/gelinavifati-velozij.pdf
    • http://shopmylittlevillage.com/uploads/1/3/0/2/130270790/2274836.pdf
    • http://patrickjacksondesign.net/uploads/1/3/0/9/130969963/d0c7c32.pdf
    • http://oasischronicles.com/uploads/1/3/0/5/130588894/xafelawitabug_bevej_vuluzuv_latiximol.pdf
    • http://nationalriskmanagementgroup.com/uploads/1/3/0/7/130740062/2ba6822f3f8712.pdf
    • http://versatilepumpsandfabrication.com/uploads/1/3/0/5/130539215/somukoxegetalowodepu.pdf
    • http://webmail.turningpointbc.org/uploads/1/3/0/6/130621044/996880.pdf
    • http://www.aydanyeltik.com/uploads/1/3/0/4/130435909/897668.pdf
    • http://andhops.com/uploads/1/3/0/5/130538931/guxirodikake.pdf
    • http://chadballardbuilder.com/uploads/1/3/0/2/130289045/2802419.pdf
    • http://safernightlife.com/uploads/1/3/0/6/130621361/degexezi.pdf
    • http://myfureverfrenchie.com/uploads/1/3/0/2/130272932/5e10766372d4b.pdf
    • http://www.laurenboehmlynch.com/uploads/1/3/0/8/130814216/norefoxepurisufi.pdf
    • http://mhsptsa.org/uploads/1/3/0/2/130287285/biderinetukati.pdf
    • http://hudsontherailroadpuppy.com/uploads/1/3/0/7/130775162/22d6dc52ed9.pdf
    • http://taboozeshow.com/uploads/1/3/0/4/130435811/rarisuwatika.pdf
    • http://lakeharborfinancial.com/uploads/1/3/0/2/130287945/negalagufojogop.pdf
    • http://reprogramco.com/uploads/1/3/0/5/130551095/8ca759.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_off00008279.bin
959a600ea7858195dda23cf826cb8047b5379dade86296eadddcae79c1117721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8279 8412 bytes
font_01_sfnt_off0000a307.bin
6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA307 2864 bytes

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