Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe2491ac542c39c…

MALICIOUS

PDF

82.2 KB Created: 2021-02-21 17:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1d576c428fd26af448890ca3a660b23d SHA-1: bf789b61d35be6c9296f5d3e3a5361bdb10e7981 SHA-256: 6fe2491ac542c39c4906be2761b8117e1762d90110add4096bab63873586bc69
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous links suggests a content-farm or link-farm approach to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=2005+cadillac+sts+v8+0-60 In PDF document text
    • https://cdn.sqhk.co/ranemagesoga/gihggi0/teker.pdfIn PDF document text
    • http://momentshop.website/free_online_bingo_win_real_money_usal9qzf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_5fd1aff2ea3e2.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/iivShiM/2019_sprinter_dipstick.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601489e62a496.pdfIn PDF document text
    • http://qiwi-wallet.online/alphabet_hbreu_bibliquer4c45.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/BuiclPI/tower_crush_hack_yeuapk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_600e4eac15156.pdfIn PDF document text
    • http://luminar4-download.xyz/screen_recorder_with_video_recorderudcnn.pdfIn PDF document text
    • http://nat-fru.space/novobufinokelemokebis599ms.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/cJWjcNx/97980788025.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/Aihhjij/34891061505.pdfIn PDF document text
    • http://my-favshopd.online/british_museum_guided_tour_spanishqvd02.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/QhEijAC/download_game_yurei_ninja_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/VbUifzQ/8669038275.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/chjiebz/forest_deer_hd_live_wallpaper_download.pdfIn PDF document text
    • http://trenolgia.buzz/respiracion_anaerobia_y_aerobiauqml6.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/augcVy7/accubow_2020_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukefuxatolu.epizy.com/cycleops_hammer_firmware_update_android.pdfIn PDF document text
    • http://bugelinuxobeva.epizy.com/45806812297.pdfIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 5580 bytes
SHA-256: 952010d36424d2c569608b63c89be9d4c0044f57bbb36d5486977d6196f1021e
font_01_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 12140 bytes
SHA-256: 6c2cec8422b9bc5245a079c07337355c6fa4accbe5af8532de9da640b830b5d4