Malicious PDF — malware analysis report

Static analysis result for SHA-256 068e119a85076eeb…

MALICIOUS

PDF

41.5 KB Created: 2020-04-05 07:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c94a2444321e1916c043560254c42ccd SHA-1: 7eb34f47b9778abd34a315e8fee48f18e5440d54 SHA-256: 068e119a85076eeb98493c032ddd411ecd9630dc3c1ed13edefdfebcaccce327
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or SEO spam campaign. The document body, though partially corrupted, contains a URL that appears to be a lure for users seeking information on calculating triangle height. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards a tactic to drive traffic to potentially malicious or ad-filled sites.

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://teshuvah.international/uploads/1/3/0/7/130738765/130738765.html#como+calcular+a+altura+de+um+triangulo+retangulo+formula
    • http://brandyspearlsandmore.com/uploads/1/3/0/5/130551270/bufavom-jusofabawez-vowapozewivam-pulejinejewewi.pdf
    • http://thepracticeproject.org/uploads/1/3/0/3/130323555/zupodij.pdf
    • http://stemteachershou.net/uploads/1/3/0/8/130873975/295589fdda.pdf
    • http://flawdastylez.com/uploads/1/3/0/9/130969674/loketudumedusazapiw.pdf
    • http://wgreports.com/uploads/1/3/0/2/130288830/vaselaro.pdf
    • http://leadershipstrategy.org/uploads/1/3/1/3/131379832/cf562.pdf
    • http://desic.com/uploads/1/3/0/2/130271090/xusotakuterogufiko.pdf
    • http://debonteavond.com/uploads/1/3/1/4/131437753/xatapuzeli.pdf
    • http://akamaiacquisitions.com/uploads/1/3/0/3/130379466/8228382.pdf
    • http://4keepsake.net/uploads/1/3/0/7/130775840/226d89.pdf
    • http://ontariohomes4cash.com/uploads/1/3/1/4/131409167/nikivomet.pdf
    • http://onawaco.com/uploads/1/3/0/7/130775103/52530.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006869.bin
abfd3d19fbaa767e51d6d0f06cd7524b04e0fee696ede4fd0f63aa78bfa85413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6869 11044 bytes
font_01_sfnt_off00008d17.bin
2bbb93340edbd30279e3ccdfaaf7d3747fc0738ab423ebb88b9b0913653ec546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D17 2612 bytes

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