Malicious PDF — malware analysis report

Static analysis result for SHA-256 814b450785adb9aa…

MALICIOUS

PDF

47.0 KB Created: 2020-05-16 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb9a5405a9055bb158faf58606b053d SHA-1: 98a64114fe3ce39ba0a7690812bfa8455b6f94ed SHA-256: 814b450785adb9aa9e35056b871f02b5d28fc215191511ad573e996ae95e6897
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links pointing to various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://petervuphotography.com/uploads/1/3/0/7/130775259/130775259.html#html+to+pdf+python+2.+7
    • http://imatterproject.com/uploads/1/3/0/2/130289240/9423800.pdf
    • http://myoshs.com/uploads/1/3/0/7/130775593/xinoz_mozato_manapokiwetobu.pdf
    • http://npeg.eu/uploads/1/3/0/6/130604127/xiwojudite.pdf
    • http://klgroupadvisors.com/uploads/1/3/1/3/131381471/6276636.pdf
    • http://bcuban.com/uploads/1/3/1/3/131379294/bufineli_noworepema_bobujumefimovox.pdf
    • http://winfordm.com/uploads/1/3/0/4/130488891/275424.pdf
    • http://newagepunks.com/uploads/1/3/1/0/131071021/voluliluveguve-wigewedepiw-gaseliteloj-vurikajeteg.pdf
    • http://charliehandsome.com/uploads/1/3/0/8/130813269/putixinupinumuwakup.pdf
    • http://meghnaravishankar.com/uploads/1/3/0/8/130874143/gafaxamemerasodewati.pdf
    • http://eshelmantechnology.com/uploads/1/3/0/7/130738684/72ee337673.pdf
    • http://mikeintucson.com/uploads/1/3/0/8/130873841/2055414.pdf
    • http://laurfree.com/uploads/1/3/0/7/130739746/jevela.pdf
    • http://pleasantvalleybeekeeper.com/uploads/1/3/0/6/130620416/zudogej-moxax-rowixamawe-ginewufazelosiz.pdf
    • http://bureau155.com/uploads/1/3/0/9/130969834/dubogisil.pdf
    • http://zandali-dominion.com/uploads/1/3/1/3/131381167/kesuvasefotelafi.pdf
    • http://keepoh.com/uploads/1/3/1/6/131636627/4268896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008978.bin
959165521f6da0166c7ab9713162c6dd962db5feb178325b0f26b451ab9fa937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8978 11340 bytes

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