Malicious PDF — malware analysis report

Static analysis result for SHA-256 9baa4bda811fb42e…

MALICIOUS

PDF

34.8 KB Created: 2020-05-18 03:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ac6dc654c387f074c1528e41ff3a949 SHA-1: 423a968525255d0bde93190161e335a39ea7eb0f SHA-256: 9baa4bda811fb42ecbd91b4c98b410366c8928740a1bbc6375b92a6365708b29
96 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. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or redirection scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://shulerandsonsconstruction.com/uploads/1/3/0/5/130550983/130550983.html#how+are+you+doing+now+answer
    • http://atlantaprenatalyoga.com/uploads/1/3/0/8/130874082/2f79c7.pdf
    • http://craftyballs.com/uploads/1/3/1/3/131398560/9987818.pdf
    • http://autochipkeysandremotes.com/uploads/1/3/1/1/131164313/dasat-nutab-xazafapibekino.pdf
    • http://freeflowideas.com/uploads/1/3/0/9/130969061/340766.pdf
    • http://oclawlady.com/uploads/1/3/1/3/131379247/e5e0dd6fcce9.pdf
    • http://shanellandaaron.com/uploads/1/3/0/6/130621353/9916383.pdf
    • http://ohiobiplanes.com/uploads/1/3/1/1/131164027/8373109.pdf
    • http://letterstolawyers.com/uploads/1/3/1/3/131397950/1c3e77c.pdf
    • http://downbythelake.com/uploads/1/3/1/3/131381225/1149375.pdf
    • http://sunpink.com/uploads/1/3/1/4/131452794/4031126.pdf
    • http://homestylechildcareandpreschool.com/uploads/1/3/1/6/131637951/rotipigemo.pdf
    • http://ellapark.info/uploads/1/3/1/3/131383953/tujixemawukeneviw.pdf
    • http://thekikihamilton.com/uploads/1/3/0/5/130590521/jikalefajegeror.pdf
    • http://horizonunitedgroupinc.com/uploads/1/3/0/2/130273766/e3551d2e.pdf
    • http://maryrn.com/uploads/1/3/0/9/130969931/wujidazu_kepezat_wimule.pdf
    • http://lesbijouxburlesque.com/uploads/1/3/1/6/131636677/6175ec1d5.pdf
    • http://securitysystemsjj.com/uploads/1/3/1/1/131164351/zikavufukop-zomekedisas.pdf
    • http://grapeapesbrokerage.net/uploads/1/3/0/4/130490585/buweb.pdf
    • http://quikartist.com/uploads/1/3/0/4/130488500/rizapopaveja.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_off00005d9c.bin
93678fba58dfdd9fb85e8df6cae97517949613548880f5e03097670c3973f35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 9892 bytes

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