Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf261e304745fe1…

MALICIOUS

PDF

101.9 KB Created: 2021-04-01 15:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: df50034d3716e9e7e594c0f4cb08dea7 SHA-1: d96aa8e361631493c1ac210441905fabdf447dc2 SHA-256: 5bf261e304745fe136589323519f82626c2fb13c123f78f5d9df89a4b3b62861
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to lure users to malicious websites. Several heuristics indicate malicious redirector links and phishing attempts, with ClamAV also detecting it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to phishing or malware distribution sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=proponents+of+rational+choice+theory+pdf In PDF document text
    • http://nuveclovet.xyz/uniforme_club_america_dream_league_soccer_2019cxb47.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/calligraphy_fonts_free_download.pdfIn PDF document text
    • http://eagleaff.com/dadupafopusarulfk9sb.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/calendario_clausura_2020_liga_mx.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/lord_byron_she_walks_in_beauty.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/hernia_epigastrica_diagnostico.pdfIn PDF document text
    • http://habercigo.com/dallas_texas_map1fwmt.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/womizegalegutadus.pdfIn PDF document text
    • http://sputnews.com/striking_thoughts_bruce_leere320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/nukusenurojup.pdfIn PDF document text
    • http://riledabetime.myartsonline.com/atlas_map_of_world_free_download.pdfIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_5ad6a7273d2a47fe858438a632488c28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/76490998466.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_6df0aaa66f6d4a49bfbe3fb811d5dd36.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_d87831f35bc049a3a1e7d0ca6632714d.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_8a28ffe2fd8d4b5c90afeac03c7c0cd8.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_5e7b238dad414e50b12f8b925596d711.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_b563408625ee44d4bb3ddcc91cefa295.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_a0e26029c4b145cabe66616686657c73.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_1c5cf196201d4f50871ca83c774e087f.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_off00014dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD0 5348 bytes
SHA-256: 77e3d54b9f7dafc65297300521d54d438b01f15221b866defaed2392e6904fa3
font_01_sfnt_off00015ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFE 13024 bytes
SHA-256: 993353042b909240c3d0f28921b2a81a2f57263fa9d0db9dd7796d4203f4f73d