Malicious PDF — malware analysis report

Static analysis result for SHA-256 100da120812e0b71…

MALICIOUS

PDF

34.9 KB Created: 2020-04-16 07:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5805d8c7b6962d35f4916c7a395de9b2 SHA-1: ea7edc786f24571f3ea59a0d74825d9ffb9dad18 SHA-256: 100da120812e0b71ad641472160d99d954ed16bcddbdc4b1c20d186e7dd84b31
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to numerous external URLs, potentially for hosting further malicious content or for SEO manipulation.

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://angelwellness.net/uploads/1/3/1/3/131398358/131398358.html#comparing+fractions+worksheet+4th+grade+common+core
    • http://thehealthykitchen.org/uploads/1/3/0/5/130540458/zotabofirupade.pdf
    • http://lorenfa.it/uploads/1/3/0/5/130539697/xagoz_famaxima_gamuzudip_ramibijo.pdf
    • http://caremiles.shop/uploads/1/3/0/5/130550880/zusapedena_rixeliraso.pdf
    • http://allcityclothingco.com/uploads/1/3/1/4/131453086/1da539.pdf
    • http://255402956757559267.com/uploads/1/3/1/3/131397946/kexugimabudologa.pdf
    • http://chelseaspetservice.com/uploads/1/3/0/5/130540118/ximutulodos-dolizajidusamo-kotozubobodema.pdf
    • http://ccccooloolaculturalconnections.com/uploads/1/3/0/6/130639493/folurozul-lavozonovisok-winifurobudog.pdf
    • http://danceswithcranes.com/uploads/1/3/1/3/131384567/6939563.pdf
    • http://timebillingandmore.com/uploads/1/3/1/0/131069824/rimabigexu_desirimefi_vitikusosun.pdf
    • http://microsofttempejllproposal.com/uploads/1/3/1/6/131637921/800833.pdf
    • http://tinyhousesdownunder.com/uploads/1/3/0/6/130639368/desiki-buxajup.pdf
    • http://portertradingconsulting.com/uploads/1/3/1/4/131455543/dovevumagerizive.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_off00005d0d.bin
33ee49f416d675243ebfcb782a0a1d6b083f7067dcb3e473d0d6eaf30adbe370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0D 8380 bytes

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