Malicious PDF — malware analysis report

Static analysis result for SHA-256 4965a22fb14f73bb…

MALICIOUS

PDF

42.0 KB Created: 2020-03-12 04:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2fa574c7f939d55d247e226db01b100d SHA-1: 0fa08308256af71813f74652c4830bd3ca2c07ae SHA-256: 4965a22fb14f73bb8589d5525a0507f6d34dc42e98baebb44d2249bab811cf90
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files on different domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially used to distribute malware or engage in phishing. No scripts were extracted from this sample.

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://tcsonline.net/uploads/1/3/0/5/130551103/130551103.html#descriptive+survey+method+questions
    • http://m2d-design-interieur.com/uploads/1/3/0/6/130603971/2944fa1c17a30.pdf
    • http://wsufamilies.com/uploads/1/3/0/4/130488172/cea76.pdf
    • http://cullmanconcerts.org/uploads/1/3/0/2/130272350/b59fd327c.pdf
    • http://www.chineseerbes.com/uploads/1/3/0/6/130621663/7219941.pdf
    • http://swboffice.com/uploads/1/3/0/4/130489434/1961526.pdf
    • http://greatbigwoody.com/uploads/1/3/0/5/130542773/bupufobosuvewinivod.pdf
    • http://easternfiltration.com/uploads/1/3/0/7/130739525/miwukowetadutivu.pdf
    • http://www.digforfamilyroots.com/uploads/1/3/0/8/130813650/jurisegumuf.pdf
    • http://johnridleyformayor.net/uploads/1/3/0/3/130323703/depokekanalete_paxijusisu_xegexizomupuzi.pdf
    • http://stuffedinbozeman.com/uploads/1/3/0/3/130379121/45036f893.pdf
    • http://bellecreekresources.net/uploads/1/3/0/6/130604321/nujirurogogepafe.pdf
    • http://albertedwardhops.com/uploads/1/3/0/7/130775376/bizozaguxu-rijit-jixuwav-pusofal.pdf
    • http://webmail.creekdontriseband.com/uploads/1/3/0/6/130605482/b696d6d.pdf
    • http://thinknxt.com/uploads/1/3/0/2/130272295/5688089.pdf
    • http://heauxbeaux.com/uploads/1/3/0/5/130551050/wafubabig.pdf
    • http://rnbproperties.net/uploads/1/3/0/6/130639513/66870b3dbc3293.pdf
    • http://tonces.net/uploads/1/3/0/6/130620763/fodesa.pdf
    • http://acmeessence.net/uploads/1/3/0/3/130323187/9881108.pdf
    • http://woodflooringstlouis.com/uploads/1/3/0/6/130639903/7441123.pdf
    • http://mta-sts.mail.claylinen.com/uploads/1/3/0/6/130620237/d718ab.pdf
    • http://www.albionpodcasts.com/uploads/1/3/0/7/130739290/wagaze.pdf
    • http://johntejada.net/uploads/1/3/0/6/130639784/3551118.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_off00007e6a.bin
b64428af558e18ed9a900fda7fbf4d439ecc2f95c968a74cfaf3df2968de6c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6A 7092 bytes

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