Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4863dbbd4208b7…

MALICIOUS

PDF

37.7 KB Created: 2020-03-15 13:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3b3de26286aa0f92ba855e2441379d3 SHA-1: b43fe85c39aa95317db8184d0b058ce9ccf3367c SHA-256: 9c4863dbbd4208b7204a9bb0259c961a662df9ca3c347380dd916a7d62c0463e
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as Pdf.Dropper.Agent-8941411-0. The embedded URLs likely serve as a distribution mechanism for further malicious payloads or phishing 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-8941411-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8941411-0
  • 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://webmail.pulsefitnessmandan.com/uploads/1/3/0/4/130475883/130475883.html#present+tense+worksheet+for+grade+3
    • http://royaltrainridesrentals.com/uploads/1/3/0/5/130550797/zonoduma_wofej_kopawatatekakur.pdf
    • http://csperfecttie.com/uploads/1/3/0/7/130776150/0571ba3694f4b9b.pdf
    • http://tcsonline.net/uploads/1/3/0/7/130739755/nazigavaz_fanuf.pdf
    • http://www.prettygyrl.org/uploads/1/3/0/4/130483498/6339b2f.pdf
    • http://dianasinsurance.com/uploads/1/3/0/7/130775503/532093.pdf
    • http://beyourselfie.net/uploads/1/3/0/4/130488940/sibodadajuloma.pdf
    • http://www.eepto.com/uploads/1/3/0/7/130740072/7839133.pdf
    • http://www.e-stringer.com/uploads/1/3/0/6/130604537/80e7e0fc.pdf
    • http://mta158.qualitynow.net/uploads/1/3/0/3/130323511/0aae07c92a8fbcc.pdf
    • http://nsw-ba.com.au/uploads/1/3/0/2/130289695/22de3458d5f.pdf
    • http://dontappan.com/uploads/1/3/0/9/130969066/3751291.pdf
    • http://app-requests.com/uploads/1/3/0/2/130272918/jigutoradu.pdf
    • http://www.havensaloncotati.com/uploads/1/3/0/9/130969198/paxojopegu.pdf
    • http://commercialleasenegotiation.net/uploads/1/3/0/6/130604785/kavusorolumufa.pdf
    • http://veidoo.org/uploads/1/3/0/6/130603789/461b5523f573d6.pdf
    • http://nanakexpeditors.com/uploads/1/3/0/5/130550764/nepunise.pdf
    • http://truckingjobstour.com/uploads/1/3/0/6/130603971/xewajurirelinuvon.pdf
    • http://nudevember.org/uploads/1/3/0/6/130605517/podorawizu.pdf
    • http://mobilenotaryenlosangeles.com/uploads/1/3/0/6/130621312/00d6830cfbc.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_off000068a4.bin
d6b4191c5954aa667ff247a5ae9dd36b9a3c45aed00f2374ec5b0eba2cdc1f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A4 8000 bytes

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