Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7d38b7c6c6f68b…

MALICIOUS

PDF

29.9 KB Created: 2020-05-17 10:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3dc8241c07c56b2dd823adb61e6e85 SHA-1: d7d12a8c970047be88b6563c82a1c996d07b5791 SHA-256: 4e7d38b7c6c6f68b3ced02f8580465314b87be0d5eca828d39d651c3d34674b7
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 to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains a mix of seemingly unrelated text and the embedded URLs, suggesting a lure or redirection mechanism. The primary attack pattern appears to be a link farm designed to manipulate search engine results or distribute further malicious content.

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://eetiklekkerwel.nl/uploads/1/3/0/6/130621374/130621374.html#om+sri+raghavendraya+namaha+song
    • http://keepyourappointment.com/uploads/1/3/0/6/130620575/fobalusegux-bolugaderiwi-dolen.pdf
    • http://paintmycanvas.info/uploads/1/3/0/4/130435571/pewozoranobax.pdf
    • http://ab7.business/uploads/1/3/0/4/130488993/sevajitoraz_dozilukononamad_kizaxi.pdf
    • http://familyheatingandairtx.com/uploads/1/3/0/7/130738667/1379819.pdf
    • http://segarraproductioninsuranceservices.com/uploads/1/3/0/6/130621214/dakolidoxevogafalipo.pdf
    • http://ethans-clubhouse.net/uploads/1/3/0/8/130814761/2627757.pdf
    • http://mymasterconnect.com/uploads/1/3/1/4/131406893/kufes-taderib-bofusuno-levifogibe.pdf
    • http://klgroupadvisors.com/uploads/1/3/1/4/131454683/tunixoxujekabibedano.pdf
    • http://jewniorgames.com/uploads/1/3/1/0/131070161/nafevod.pdf
    • http://debaite.com/uploads/1/3/0/4/130493968/7b2c3e5f.pdf
    • http://martadance.com/uploads/1/3/0/4/130477110/vovifazorofij_dunowodojinude.pdf
    • http://tjpottery.com/uploads/1/3/0/6/130620614/3379182.pdf
    • http://thepowerofwordscompellingconciseengaging.com/uploads/1/3/0/7/130738841/muvezomiko.pdf
    • http://medievalnow.com/uploads/1/3/0/7/130775929/763306.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_off00004c73.bin
9378b0f83eec91bf5822e47ddd744f0df3988278c68e1707541b306ad9f585c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C73 9336 bytes

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