Malicious PDF — malware analysis report

Static analysis result for SHA-256 d594ea210f854cdb…

MALICIOUS

PDF

80.4 KB Created: 2021-04-17 00:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d3bdbf374a62db7a27990d8aec6bcad4 SHA-1: 28d547faa4addb83bd07c16d397542cd3dd3e881 SHA-256: d594ea210f854cdbc7960d8f49546463bc91c7ccae29ecd2030cdb46764fe24b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=.net+core+2.1+tutorial+pdf PDF link annotation
    • http://itawegan.space/android_studio_sdk_manager_missing_from_toolsx8e0s.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/hdPWOjj/93415473093.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/5343286.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/DKuWjj4/bromley_glades_store_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/dFT3gcm/blades_of_brim_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/jgFlifR/miui_5_icon_pack_apk.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/55ff0.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/s2ILhej/download_game_fatal_raid_mod_apk.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/pinusubibudubavuwe.pdfIn PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/2999323.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/7jfUeUn/horse_running_on_water.pdfIn PDF document text
    • http://shop-onlain.fun/435219986913r9tb.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/6hf3gd9/tap_tap_dash_apk_ios.pdfIn PDF document text
    • https://totibevopomuv.weebly.com/uploads/1/3/0/8/130813722/2472952.pdfIn PDF document text
    • http://jopkapopka.online/31355559746aqbnj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09ce6b1-171a-4191-b747-7c0de9701bff/77815910182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065c760d-a4b9-4171-b45d-522c1810f1df/how_to_deal_with_a_spouse_with_anger_issues.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_56c61c0afc71430a9cb1a774fba5e816.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_1dfe5ab48ce3488db9be21c81e18dddc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5092 bytes
SHA-256: 592ab2c995ca20d4cbebc766dcd9278ffae9b56a8e88a08b31d19f0233d0558f
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 11756 bytes
SHA-256: d8729e1940c036ecbdf659adcd99dfcb7bad102ba8fc997c392c16a51f05b157

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