Malicious PDF — malware analysis report

Static analysis result for SHA-256 475b7e9e98754e55…

MALICIOUS

PDF

36.2 KB Created: 2020-03-15 05:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 098aa704020a56a4bed001fbb7744f8e SHA-1: 7c18b9b4e3483f96b466a035f7e33dd3a0e10bdf SHA-256: 475b7e9e98754e5505fa30eaa790ee5f5ffec65072f0003981b1748fdebcd538
94 Risk Score

Malware Insights

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

This PDF document contains a lure for a "mandatory reporting nsw phone number" and a large number of external links to other PDF files hosted on various domains. The PDF_SEO_LINK_FARM heuristic indicates a link farm strategy, and the ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The primary goal appears to be directing users to potentially malicious external content through a deceptive pretext.

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://74-123-73-134.mgwnet.com/uploads/1/3/1/1/131164121/131164121.html#mandatory+reporting+nsw+phone+number
    • http://mon-tatis-majolica.com/uploads/1/3/0/6/130620538/6299614.pdf
    • http://aroundtheworldin80minutes.org/uploads/1/3/0/4/130435611/zoxojepenivivaje.pdf
    • http://www.ephilippines.org/uploads/1/3/0/8/130814007/mafudoledi_kigurolu_basamibe.pdf
    • http://edgewaterglenhomes.com/uploads/1/3/0/6/130621459/8753689.pdf
    • http://synergysoundltd.com/uploads/1/3/0/5/130589101/jotokibesoritufox.pdf
    • http://cakesclozet.com/uploads/1/3/0/7/130738554/lifexosowagiliso.pdf
    • http://houstontxhomeinspection.com/uploads/1/3/0/9/130969284/juditozajudu.pdf
    • http://helse-velvare.no/uploads/1/3/0/6/130603769/vutuxokigasoda-xesubagewavirov-tuvubiwojika.pdf
    • http://andreadahljohnstonspeechpathology.com.au/uploads/1/3/0/5/130538918/4644401.pdf
    • http://thermofaxscreens.com/uploads/1/3/0/8/130814408/304935.pdf
    • http://lightjab.net/uploads/1/3/0/6/130621574/kositizinuvabo-jugama-diruleberin.pdf
    • http://steepisland.net/uploads/1/3/0/4/130435582/momul.pdf
    • http://northpointebaptistministries.com/uploads/1/3/0/4/130475964/2042fef52.pdf
    • http://www.boost3c.com/uploads/1/3/0/7/130776200/5727516.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_off0000671b.bin
801b11d9641886044f4175eccea24a8ca435bbe5c86b9099b548a7883966c7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 7172 bytes

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