Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f203af061c28870…

MALICIOUS

PDF

39.6 KB Created: 2020-03-08 12:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 278fe5c8bf9f14c585c5802ed357984a SHA-1: db4f37184c61e27545847cd30cff81cca0d7d6ca SHA-256: 5f203af061c2887003f4940a8fdea9b3d5616b283915c88854f2f078dcc7855e
96 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 appear to be part of a link farm designed to improve search engine rankings. The document body, though partially corrupted, contains text related to editing PDF files for free, suggesting a lure to trick users into visiting these links. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown-reputation URLs supports a phishing or malware distribution attempt.

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://zhenrenxianchangyouxi.br3h.com/uploads/1/3/0/6/130639413/130639413.html#how+to+edit+pdf+file+in+adobe+reader+for+free
    • http://cordivanoapparel.com/uploads/1/3/0/4/130483087/pejabebit-gufigavubez.pdf
    • http://palmbeachcaregroup.com/uploads/1/3/0/6/130620436/5187241.pdf
    • http://www.fromflab2fit.com/uploads/1/3/0/7/130776042/difiduvesunoj.pdf
    • http://www.hmvolunteerservice.org/uploads/1/3/0/8/130814715/vodavu-rejowabago.pdf
    • http://octobercrickets.net/uploads/1/3/0/6/130621871/fixeriwopusigawo.pdf
    • http://www.hubcaphobbies.com/uploads/1/3/0/3/130324011/likizapugadewov_dugevot.pdf
    • http://powerstonesearth.com/uploads/1/3/0/5/130588554/4563184.pdf
    • http://edtnetworks.com/uploads/1/3/0/6/130620627/dadegiragujowakirix.pdf
    • http://ttime-golf.com/uploads/1/3/0/6/130639251/juwoxabeza.pdf
    • http://moversinmiami.net/uploads/1/3/0/6/130639540/zetawituk-kevuraferof-desedosibubomi.pdf
    • http://fireworks-superstore.com/uploads/1/3/0/6/130621153/bopepulagavav.pdf
    • http://newhopeakron.com/uploads/1/3/0/6/130639565/c370f4b.pdf
    • http://the-sustainables.org/uploads/1/3/0/5/130543170/227320.pdf
    • http://beeidentification.com/uploads/1/3/0/5/130589345/c49ecf23ab6.pdf
    • http://smpt1.warnerfinancialgroup.com/uploads/1/3/0/5/130550891/3881618.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_off0000721f.bin
dd85aedaaa09503e5ffc54d1f187635c3f283d454f5e2cf710fe6e577a5e2ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 7872 bytes

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