Malicious PDF — malware analysis report

Static analysis result for SHA-256 f421b6bf95a0cddd…

MALICIOUS

PDF

34.4 KB Created: 2020-05-17 09:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dadaa0902946e1d3bfadfa4ce14b1cd1 SHA-1: 8ebab9a157b78f1af71c00f8868ca7a50a13d927 SHA-256: f421b6bf95a0cddd7e2aa9bab7ffa58434e34057f9b6ae76e0e3284e9866c8ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO spam or to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely part of a link farm designed to drive traffic or host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-9167208-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9167208-0
  • 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://huboftravel.com/uploads/1/3/0/6/130604844/130604844.html#bitsat+sample+paper+free
    • http://theheatlmm.com/uploads/1/3/1/3/131379099/68a085c37fbfd1.pdf
    • http://improvwork.com/uploads/1/3/0/4/130435898/zoxupipuzape.pdf
    • http://saucynightsadultproducts.com/uploads/1/3/0/6/130604366/pijowenuz.pdf
    • http://opunsezme.com/uploads/1/3/0/6/130639456/73d7343616ae.pdf
    • http://sovereignholistics.com/uploads/1/3/1/4/131453843/nukegew_suzudulanavale_saketoz.pdf
    • http://yougotarock.com/uploads/1/3/0/2/130272267/6003828.pdf
    • http://loicschumacher.com/uploads/1/3/0/6/130639465/zuxaxukojesa.pdf
    • http://chedotteelectric.com/uploads/1/3/0/8/130814280/957529.pdf
    • http://annieflamsteed.com/uploads/1/3/1/8/131857565/sagijuze.pdf
    • http://rusticroosterbarn.com/uploads/1/3/0/5/130550774/vadupukapisun.pdf
    • http://kresekbag.net/uploads/1/3/0/6/130620353/nafonudubuwobamurow.pdf
    • http://patinagechamonix.com/uploads/1/3/0/4/130435514/nokanamonigugeta.pdf
    • http://clearcalmbreathe.com/uploads/1/3/0/7/130738710/judesagoroxumesukowi.pdf
    • http://theworthseries.com/uploads/1/3/1/3/131381693/ligudagonulakagawet.pdf
    • http://lenmacmar.com/uploads/1/3/1/3/131379255/lapug.pdf
    • http://forterraacquisitions.com/uploads/1/3/1/4/131413040/2229648.pdf
    • http://storemake.net/uploads/1/3/0/6/130603782/3770175.pdf
    • http://joelschiff.com/uploads/1/3/0/7/130738723/3b75d36.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_off00005b93.bin
5e4fd0a1acb8454235c027ecd7d9e65886afbbe478264080ae04ea2c6a61efd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B93 10196 bytes

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