Malicious PDF — malware analysis report

Static analysis result for SHA-256 6777a7940da73faa…

MALICIOUS

PDF

46.6 KB Created: 2020-04-02 04:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7760c5d13b91f54560d4b9a8615f0e0 SHA-1: 0f938a64e0e2637bee4c247f0c2544c6267d1279 SHA-256: 6777a7940da73faab0ed58ab62c682760fd27eb4b83bb416cfd1fa1669b02aac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or SEO poisoning tactic. The document body mentions "IBM retiree future health account", indicating a likely phishing or scam lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely as a dropper for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9236379-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9236379-0
  • 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://thesperobrand.com/uploads/1/3/0/5/130588270/130588270.html#ibm+retiree+future+health+account
    • http://globalclimatechange.info/uploads/1/3/0/6/130640219/7325082.pdf
    • http://equipajedemano.com/uploads/1/3/0/2/130289700/zawogobenib_goxizevozilimu_durexipuruj_wowewofu.pdf
    • http://lovemehemp.net/uploads/1/3/0/6/130621098/wavoladevizez.pdf
    • http://kerrigoodman.com/uploads/1/3/0/2/130270811/5429977.pdf
    • http://poopremovers.com/uploads/1/3/0/4/130488476/vuzavalip.pdf
    • http://dawntottongarvey.com/uploads/1/3/0/4/130436058/nugesigiwaxonuxa.pdf
    • http://triadsurface.com/uploads/1/3/0/5/130589998/711340b5c35e36.pdf
    • http://plafondtech-dz.com/uploads/1/3/0/8/130814353/vovajuxajebokepub.pdf
    • http://thesagaciousone.com/uploads/1/3/0/3/130313265/3959614.pdf
    • http://edwardolsonconstruction.com/uploads/1/3/1/3/131384696/ruzigi.pdf
    • http://neonopen.com/uploads/1/3/0/5/130551341/6258003.pdf
    • http://fcayodemo.com/uploads/1/3/1/3/131379360/dudetaleforefas-wibupe-favebipi-bazamudosi.pdf
    • http://latronlesterfundkids.org/uploads/1/3/0/3/130313294/voworizoxabi.pdf
    • http://midtrans.online/uploads/1/3/0/6/130621591/pilimexewetugo_tewovosefazuz_vawukuri.pdf
    • http://redneckfest.org/uploads/1/3/0/6/130639491/8a8ef6c6e41e.pdf
    • http://primetimeinvestmentsdmv.com/uploads/1/3/0/6/130621095/kigiliwabovifo_radad.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_off00008e71.bin
d4c361e1a4b272a4220429c6c8619b4aa7a6821046004867e548ae6d02607e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 7944 bytes

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