Malicious PDF — malware analysis report

Static analysis result for SHA-256 275bd637860bd55b…

MALICIOUS

PDF

35.9 KB Created: 2020-05-22 15:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd810d1921b16bc130b4d52c9c95a173 SHA-1: 3fee28cd1dcc685c12c44bdced4d184cf5c4ab11 SHA-256: 275bd637860bd55bb1ad9d8092dd161d775bd9d2c265d9279a922050d175b9cf
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to 'Opel vectra c repair manual free download', indicating a lure to entice users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://extelconsultores.com/uploads/1/3/1/1/131163617/131163617.html#opel+vectra+c+repair+manual+free+download
    • http://moellerchiropractic.com/uploads/1/3/0/7/130740190/dinelafivavivutupa.pdf
    • http://ourchildrenmattermd.org/uploads/1/3/0/9/130968958/8875c2916305870.pdf
    • http://dakotanaturalgoods.com/uploads/1/3/1/4/131406498/5611749.pdf
    • http://feline49.com/uploads/1/3/0/9/130969702/tusesu-xabekososim.pdf
    • http://vital-online.net/uploads/1/3/0/7/130739779/8b85ed7dc5bf02f.pdf
    • http://oclgmedical.com/uploads/1/3/1/3/131384071/83234e.pdf
    • http://fulcrum.marketing/uploads/1/3/0/2/130289240/6869748.pdf
    • http://garyzancanelli3.com/uploads/1/3/1/3/131398010/bopobizexikil-fatiwuruvi-vaxiwamiwakadij.pdf
    • http://artemisassessment.com/uploads/1/3/0/6/130621158/bofevagasot_sinojewuxegidux_pojikavujegasek_lukem.pdf
    • http://ackoeltechniek.nl/uploads/1/3/0/5/130547552/jugimofosejesof.pdf
    • http://orlandodargeni.org/uploads/1/3/1/4/131453176/zimeli-tenatigo-nuwajosokiz.pdf
    • http://mirabellaeventsandtravel.com/uploads/1/3/0/5/130590400/c7193.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_off0000611f.bin
c072a3dad527fe76f3c7bc73462252f74214496e1a8f72d00f1368432a73b156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611F 10296 bytes

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