Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83dc657411e5c2d…

MALICIOUS

PDF

34.7 KB Created: 2020-03-22 11:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c91f5e618afb2af4b78270bdf0ed94c3 SHA-1: c119c3705f1477c8a117cc3cf042f49d42aea4a3 SHA-256: d83dc657411e5c2df18d4caa04a9fdf8795206ef1b96b92a8371f1f03b465792
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. This suggests the document is primarily functioning as a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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://referral360network.com/uploads/1/3/0/9/130969627/130969627.html#manual+de+trabajo+social+manuel+sanchez+rosado+bibliografia
    • http://standrews801.com/uploads/1/3/0/5/130590537/rezisonejogo.pdf
    • http://abnerdelnorte.com/uploads/1/3/0/6/130605263/ratitam_pizelozoxuvuza.pdf
    • http://vivala-hemp.com/uploads/1/3/0/8/130814001/f642db.pdf
    • http://toplinedevelopments.org/uploads/1/3/0/6/130640063/zuwuzimoveni-xotukozowujobap.pdf
    • http://azfashionevents.com/uploads/1/3/0/9/130969148/nudobe-jolurumelexej.pdf
    • http://debugclub.org/uploads/1/3/0/5/130539114/f3eb61.pdf
    • http://grantluther.com/uploads/1/3/0/6/130604551/sofexesujuwusevevo.pdf
    • http://mccleansolutions.com/uploads/1/3/0/6/130621406/9746674.pdf
    • http://www.awiltportfolio.com/uploads/1/3/0/5/130551551/bumaranokibi.pdf
    • http://good2go-go.com/uploads/1/3/0/2/130272921/2db1a81af9248.pdf
    • http://141592.info/uploads/1/3/0/6/130639474/4597a1e.pdf
    • http://8200doral.com/uploads/1/3/0/6/130639221/xuxake-bomusuxezesul-vifoganola-fedudej.pdf
    • http://www.lmlong.org/uploads/1/3/0/7/130776749/fabofoxafiful.pdf
    • http://attorneygarvey.com/uploads/1/3/0/5/130539940/d7436eed7d7915.pdf
    • http://24millstillrd.com/uploads/1/3/0/7/130739324/6465128.pdf
    • http://www.schuberthbuilders.com/uploads/1/3/0/7/130775604/7483484.pdf
    • http://mfwwinecompany.com/uploads/1/3/0/7/130776245/2791569.pdf
    • http://idealcleaning.org/uploads/1/3/0/8/130874305/2918185.pdf
    • http://www.thereadingrumpusroom.com/uploads/1/3/0/2/130289369/5417750.pdf
    • http://www.hwl-mfg.com/uploads/1/3/0/4/130483459/nikosoxumomot.pdf
    • http://surgicaldatascience.org/uploads/1/3/0/8/130813991/4077095.pdf
    • http://bestbridalpricesme.com/uploads/1/3/0/5/130551090/fatonobaneguf.pdf
    • http://grandjourneypetlodge.net/uploads/1/3/0/7/130739362/nudozeke.pdf
    • http://perversgeil.com/uploads/1/3/0/8/130874050/3153b8691.pdf
    • http://perversgeil.com/uploads/1/3/0/8
    • 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_off00005fc7.bin
71e412e630218c8992593f3e0d910b21d6003a9f5bba724934418159cea8ce58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC7 7708 bytes

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