Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac2e4099bfe1f7b…

MALICIOUS

PDF

125.7 KB Created: 2021-03-25 13:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50f794983c15f04b6c2ebfbe9f1752a8 SHA-1: aac619889a6317697af4aa1fc0f2e07d5690a375 SHA-256: 3ac2e4099bfe1f7bbffccde157b274a8c013d7cb35be8e6fdf8d73e19be50d4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected the file as a 'Pdf.Phishing.Trojan'. The presence of embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and heuristics point to a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=polymeric+biomaterials+pdf
    • https://cdn.sqhk.co/jezuleku/aRihhe0/hay_day_online_para_pc.pdf
    • http://glasshookahcatering.com/20332818776swoqo.pdf
    • https://cdn.sqhk.co/kitijorawul/0477nR9/92708749130.pdf
    • http://stavki.link/3114816724134zz3.pdf
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/vonudumon.pdf
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5ff4ab9ea375a.pdf
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/wozirupojupigab.pdf
    • https://dibarovufi.weebly.com/uploads/1/3/0/7/130776786/fonofe.pdf
    • https://lotutomoze.weebly.com/uploads/1/3/4/3/134309944/153ba4cd.pdf
    • https://tozupolut.weebly.com/uploads/1/3/0/9/130969077/517177.pdf
    • https://cdn-cms.f-static.net/uploads/4447079/normal_60483d77c6c27.pdf
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5ff7ffe06822f.pdf
    • https://cdn-cms.f-static.net/uploads/4409797/normal_600be10226eaa.pdf
    • http://cuzinfo.ru/gta_4_patch_1.0_8.0_download_deutsch9vivc.pdf
    • https://cdn.sqhk.co/xolovagi/GoEZ0hg/best_brawl_stars_characters_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_605a600fc598e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0fd28251-419d-4f95-84c1-171c0c410790/57991943763.pdf
    • https://uploads.strikinglycdn.com/files/d5b37597-2a5e-4ee6-a8a9-1d22ce7e1d52/how_did_the_allies_mobilize_all_of_their_resources_for_the_war_effort.pdf
    • https://uploads.strikinglycdn.com/files/21c4f0a5-c065-4c2e-84f6-14d0f592f3d0/31042563596.pdf
    • https://uploads.strikinglycdn.com/files/48f72894-0df9-4be4-a17a-e4f739d2e6ea/is_coway_air_purifier_good.pdf
    • https://uploads.strikinglycdn.com/files/f6c715bf-3fe8-443c-868e-f9e35a87d047/rikutadof.pdf
    • https://uploads.strikinglycdn.com/files/514c8e64-bf03-4364-aa93-00f73e17e929/23577339875.pdf
    • https://uploads.strikinglycdn.com/files/199ad640-7155-48ec-9e50-61d6a8592e99/niv_life_application_study_bible_third_edition_personal_size_leathersoft_gray_teal_red_letter.pdf
    • https://uploads.strikinglycdn.com/files/d354ef3b-350f-4633-b2be-2615d80292bf/directv_genie_mini_installation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019dd0.bin
143e7e02173959992e0ce7cd75469bbfd9fefa20bc470bd5f1cce6af742fb5f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x19DD0 5228 bytes
font_01_sfnt_off0001af91.bin
a8a3180d42d0c1d426c61dc2d7d8421a20cc49c93af02e0cff5c50c973c1ea93
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF91 13436 bytes
font_02_sfnt_off0001dac2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAC2 4324 bytes