Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15b4aee280486d7…

MALICIOUS

PDF

37.3 KB Created: 2020-05-20 18:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6765d26759f03237204ab952dd8232e SHA-1: ea1ca60d4d6081cf2b8198d7c7df8738a1bbe64f SHA-256: a15b4aee280486d7ae74839cf22379d9e15afccfb70ae509a8f797c023c1083c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a link farm or SEO spam, with a large number of embedded external links pointing to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to these external resources, which could be used for distributing malware, phishing, or other malicious activities. No scripts were extracted, limiting the analysis of direct payload execution.

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://4gen4.org/uploads/1/3/0/7/130775551/130775551.html#pentagon+shape+define
    • http://lunaumbrawinery.com/uploads/1/3/1/4/131453051/voleb_popagaxizividis_bikutorubefawa.pdf
    • http://hometechbms.com/uploads/1/3/0/4/130483900/sudopusagepukemer.pdf
    • http://newproductinstitute.info/uploads/1/3/1/3/131379980/raluvepu.pdf
    • http://antichesociety.com/uploads/1/3/1/3/131384250/360fa4543960b04.pdf
    • http://brownestonetravel.com/uploads/1/3/1/3/131384606/3719636.pdf
    • http://somersetshandyman.com/uploads/1/3/0/7/130738991/notubozolaza_zoboxepoxe_tujaf_nenokafajakobo.pdf
    • http://dazzlingexpressions.net/uploads/1/3/1/4/131438024/dukofufefowodip-gufidinapipaj.pdf
    • http://creativechristian.club/uploads/1/3/0/6/130639152/rujog-zamekugo-wotudafejer.pdf
    • http://qualityhealthwellnesssuplies.com/uploads/1/3/0/6/130639929/2077c31.pdf
    • http://mycreditscoreiswhat.com/uploads/1/3/0/4/130483109/cb769dea7e6.pdf
    • http://propaintingandstaining.com/uploads/1/3/1/4/131437361/felepesipisufage.pdf
    • http://hawaiiqualitypo.com/uploads/1/3/0/4/130435978/sapexigim_wefog.pdf
    • http://bigtexblack14.com/uploads/1/3/0/7/130776358/77dd41a0f11776b.pdf
    • http://johnsons11ed508portfolio.com/uploads/1/3/1/8/131871439/gefefosikerifeja.pdf
    • http://downsmassage.com/uploads/1/3/1/4/131437957/kituda.pdf
    • http://bwizebuildingservices.net/uploads/1/3/0/6/130639300/3039354.pdf
    • http://wlcftv.com/uploads/1/3/1/8/131856669/565a463cd48bb.pdf
    • http://westysllc.com/uploads/1/3/1/4/131408280/9619128.pdf
    • http://lisaellisfineart.com/uploads/1/3/0/3/130323173/c627d007f.pdf
    • http://simplyessentiallife.com/uploads/1/3/0/7/130776819/04a6ed1a72b.pdf
    • http://arroyobeachvb.com/uploads/1/3/1/3/131397971/cfafe1ea44.pdf
    • http://thomesbrosequipment.com/uploads/1/3/1/6/131606066/zodake_momiwosigeje_babasalomiw_timutas.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_off000065c9.bin
bed588f36f9a0d83a4e419f26daa3c4a3f556284cea7b54770c7a47ccfa6415d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C9 10468 bytes

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