Malicious PDF — malware analysis report

Static analysis result for SHA-256 23afcef714ca9e9b…

MALICIOUS

PDF

32.5 KB Created: 2020-06-08 22:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5108192a7b5475cdcc142e98d9e479 SHA-1: 7a825ce67f251808de189a972483c9d311d25f0b SHA-256: 23afcef714ca9e9b6d2bf04404475924f0317af5b5247e3c51045d66dd664137
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This pattern is indicative of a link farm or a phishing campaign designed to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

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://mail3.street-sharp.com/uploads/1/3/1/8/131872079/131872079.html#choisir+la+bonne+op%25C3%25A9ration+cm1
    • http://jp.kyosakura1.net/uploads/1/3/1/3/131380354/bazupaviniw-newulav.pdf
    • http://jessicafcornelius.com/uploads/1/3/0/5/130588396/67aa27a6f.pdf
    • http://theatteberrys.com/uploads/1/3/0/9/130969000/domudelewirixizi.pdf
    • http://ayumitoyama.com/uploads/1/3/0/6/130639509/fatixanilijokum_jifefoj_jekewederivola_nololivobaximuf.pdf
    • http://mta-sts.mx.kristincasaletto.com/uploads/1/3/0/5/130547286/9631006.pdf
    • http://snapshotworkshops.com/uploads/1/3/0/6/130640239/jowibigewepar-litakonev-bunezebu.pdf
    • http://tutoring.dk/uploads/1/3/0/3/130323182/5191186.pdf
    • http://aphhc.us/uploads/1/3/0/2/130289669/sifisinulurag_revedi_lawoviduv_golodezewemedig.pdf
    • http://hostmaster.royallescircus.com/uploads/1/3/0/5/130588701/a5f3c00219d.pdf
    • https://bapajuzo936771123.files.wordpress.com/2020/06/72026468405.pdf
    • https://wifonaniput.files.wordpress.com/2020/06/83359600044.pdf
    • https://lafesus.files.wordpress.com/2020/06/gizopusitisax.pdf
    • https://fudamowoz.files.wordpress.com/2020/06/10553306793.pdf
    • https://fewogixaba.files.wordpress.com/2020/06/13796752229.pdf
    • https://zafuwuma.files.wordpress.com/2020/06/dowubemebotawaxonizused.pdf
    • https://tifuriw.files.wordpress.com/2020/06/natigimivus.pdf
    • https://tofosigon.files.wordpress.com/2020/06/sijivuf.pdf
    • https://mapomipat.files.wordpress.com/2020/06/31822796203.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_off000050a7.bin
9acb657a0b5aae4a8a842aa1d1ba71dbe971483d4e2eeb0b60dcb71b351ef377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50A7 10972 bytes

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