Malicious PDF — malware analysis report

Static analysis result for SHA-256 0887bbd22126f55d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-18 09:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ca70342043aa9bf7381e3d217a766d2 SHA-1: 74d40869e90b53289b360bed4208b8c4b3b5de2b SHA-256: 0887bbd22126f55d4662428a7e891f3dfbad3c490ccc38ab21a9bfc0d13bd9f6
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. One of the primary external URIs, 'https://gimoguvi.ru/123?utm_term=idl+reporteros+nava', is flagged as unknown reputation, indicating a potential malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://gimoguvi.ru/123?utm_term=idl+reporteros+nava
    • https://cdn-cms.f-static.net/uploads/4455894/normal_6028c5c139979.pdf
    • http://paruxezogu.mygamesonline.org/ximibegosofomopogaxen.pdf
    • https://cdn.sqhk.co/botikavanov/fjiFzji/62235973888.pdf
    • http://tonevagewalilu.medianewsonline.com/free_african_history_books.pdf
    • https://cdn-cms.f-static.net/uploads/4462708/normal_6027eb4daf29b.pdf
    • https://cdn.sqhk.co/zanotunuzi/oFoOXia/marvel_s_runaways_season_2_episode_8_cast.pdf
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5fd0b7ff7f920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_650ce84331f24861a4a50d25ba2e6787.pdf?index=true
    • https://s3.amazonaws.com/tumasun/62356077887.pdf
    • https://s3.amazonaws.com/lebaxa/sojuxiboko.pdf
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_34ad4c4909d048eb996926d922149ace.pdf?index=true
    • https://s3.amazonaws.com/xukonakefules/geographical_information_system_course_in_uk.pdf
    • http://supuwevul.atwebpages.com/21747519184.pdf
    • https://s3.amazonaws.com/nijosinizo/netflix_app_onto_laptop.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff6.bin
648ee36f9639946fd2b747a39e481096ea02c626539cade9e8de8d3eefef886c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 4948 bytes
font_01_sfnt_off0000f0da.bin
284edd909360629dd8f07eea34b493b849a1a5dc922fbf8efbd2364d44c89a75
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 12084 bytes