Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99365d288fded63…

MALICIOUS

PDF

85.4 KB Created: 2021-03-23 14:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 788053fbb0884e414d20bef44d9c1753 SHA-1: 747e62d20fc396f6b84781325f47d574d0dab3f9 SHA-256: f99365d288fded632b5ab30c15ebea076fe751cb9feb4e7da4d80897ae0eb544
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being dugedepap.ru. The document body, though heavily obfuscated, suggests a lure related to a 'Eureka vacuum cleaner repair manual'. The presence of multiple disposable hosting links and a high ML classifier score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://dugedepap.ru/wix?keyword=eureka+vacuum+cleaner+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371246/normal_602864a516b4a.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/accouchement_du_siege.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/33953274386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_6052b89bcab9a.pdfIn PDF document text
    • https://cdn.sqhk.co/wevodapobu/jhi8oKZ/60095649763.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/Exsjfm0/zimabagagegudaruvido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_6056d36f9915e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fd0af89a5d41.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/habitat_of_bryophytes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_600c9cc354aa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_ccdf60377cc7480eb6a59fb1b498e847.pdf?index=trueIn PDF document text
    • http://redifigikutusoj.myartsonline.com/95022187189.pdfIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_63755b9236ed4075ab8f68efe8fd35e5.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_a0ff9c7210c641508d8cbbc26c7c5c2f.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_13498f34648c4e7eb4304f69bf65e167.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_f5ae89a4c2774675a8cb8a385bd9acf2.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_bb422987ff7b4f7991681a94a70bd6af.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_5625d4c0947d4f77b12dc3ff5678568d.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_b7b6d9cce2414220bb93e6f09a99f493.pdf?index=trueIn PDF document text
    • http://fepetixapokurob.myartsonline.com/30895584987.pdfIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_4327a94b246047b5912cf1f2da939832.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 4984 bytes
SHA-256: f92be2b5c63d6e5b028603bbf4435859ab108f044398bd644192a7707dc18fb6
font_01_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 11248 bytes
SHA-256: 237ec2fa3b9b215642526003e7a634f366febec44a61a4063baf05417a50cea4