Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac4bd6a2a492b8e…

MALICIOUS

PDF

47.5 KB Created: 2020-03-29 06:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0bfd0b79d8fc78fa263a3046fb530fc SHA-1: 5e67a0dae8cbe9e6d03f081360524d0b69483d87 SHA-256: 8ac4bd6a2a492b8e50984a89cb5da8f31c241f644af6f3b783d8ca45377bf5ff
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF sample exhibits characteristics of a link farm or SEO spam campaign, designed to drive traffic to numerous external PDF files hosted on various domains. The document body, though partially readable, contains obfuscated text and embedded URLs that point to these external resources. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates a malicious intent to distribute or redirect users through a network of linked documents, likely for malicious purposes such as phishing or malware distribution.

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://bodyworkbybarb.com/uploads/1/3/0/5/130589270/130589270.html#que+es+la+refutacion+de+argumentos
    • http://j-z-chapo.com/uploads/1/3/0/9/130969923/fikenaxomuxijanisut.pdf
    • http://collegelinkedin.com/uploads/1/3/0/3/130313854/3494837.pdf
    • http://vastservicesgroup.com/uploads/1/3/0/6/130605430/gowetabezenog.pdf
    • http://calwaterforum.com/uploads/1/3/0/2/130288962/e22679468e8cb55.pdf
    • http://weedinsure.com/uploads/1/3/0/5/130589433/lavaxir.pdf
    • http://halfdollarhorror.com/uploads/1/3/0/7/130739416/pibawebuma_xazuguxij.pdf
    • http://5weeksto140.com/uploads/1/3/0/6/130604653/gukofamumaku_wijeku.pdf
    • http://www.fully-booked.net/uploads/1/3/0/9/130969497/524a92a2.pdf
    • http://happyweitravel.com/uploads/1/3/0/6/130605168/3728620.pdf
    • http://mrobertsart.com/uploads/1/3/0/9/130969754/0611eff7c.pdf
    • http://blackwatertradegroup.com/uploads/1/3/0/9/130969999/rulomiwomex.pdf
    • http://hostmaster.watersgreendental.co.uk/uploads/1/3/0/7/130738973/jufut.pdf
    • http://northwesthennepinfamilyservicecollaborative.com/uploads/1/3/0/2/130274315/xokozodiki.pdf
    • http://ns.centennialtimberframes.com/uploads/1/3/0/6/130639935/7c1384e8d.pdf
    • http://blueridgepralinecompany.com/uploads/1/3/0/7/130739567/padab-balunum-vukelutinupedu-purefob.pdf
    • http://bg2g.shop/uploads/1/3/0/9/130969742/8099447.pdf
    • http://thelashco.com.au/uploads/1/3/0/6/130639038/3520903.pdf
    • http://my-backyard-farm.com/uploads/1/3/0/6/130640142/03f990f9.pdf
    • http://www.dc-juanita.com/uploads/1/3/0/4/130435978/gibejal-diwodogoboje-zitesowida.pdf
    • http://234360060668842261.com/uploads/1/3/0/5/130544494/dedini.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_off00007106.bin
76f29c270f859796417b223ac801164287a3bce49af2343b3707ba080e13806f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7106 8496 bytes
font_01_sfnt_off0000900a.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900A 2652 bytes
font_02_sfnt_off00009971.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9971 16036 bytes

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