Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b26bcdc1c188cd3…

MALICIOUS

PDF

82.9 KB Created: 2021-03-12 11:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d22c743343980663f3a7dad4afe6df61 SHA-1: c19dc16f1be7fd9a095c2181e7853a79e147cd35 SHA-256: 8b26bcdc1c188cd36a8039a76315f866658b4dbca41667e2e41fb690cad0f98f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many pointing to disposable hosting, and includes UTM parameters, indicating a link farm designed to attract traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jottigo.ru/123?utm_term=acute+appendicitis+ppt PDF link annotation
    • https://cdn.sqhk.co/sifilefu/hfhfRgg/followers_for_twitter_premium_apk_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/QthhghS/nasacort_side_effects_blood_pressure.pdfIn PDF document text
    • http://natezaka.iblogger.org/battletech_game_beginners_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/h49hsgi/19755974919.pdfIn PDF document text
    • https://cdn.sqhk.co/gidurekigov/g1icb3q/free_cursive_name_handwriting_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/hbijPhb/21664251578.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/cde919dd-e5b6-41fb-b802-fdcfa9567a8b/jipodavamorobiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfde201c-d2c1-4dab-a8af-96d9ccde0776/radogarisixevupilewali.pdfIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_9dfd129c6f3c4f5da5bea3922f99c6ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ccbe8f-1965-49ac-a044-cccc9488fa32/2008_kawasaki_bayou_250_carburetor_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6c7c2e-4cb9-46cb-9048-07d826f55e06/88456795758.pdfIn PDF document text
    • http://gifetorem.epizy.com/marlin_336_parts_and_accessories_canada.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_5ae49311d4f34f76b2778b2df8405754.pdf?index=trueIn PDF document text
    • http://zokitidekav.epizy.com/rice_sheets_spring_rolls_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/actualiser_tableau_crois_dynamique_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b5a4b2-570e-4801-96f0-6dc46186757f/the_open_window_characters_vera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6539ee02-5d98-49fb-b45b-face06ae2b5b/mubaxutipijasexorukad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3715e9a9-690a-4d33-90fb-90c48d360143/xawemuruzerurojon.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_4ab5876b2a2c4aeeb0f44f94cff38d3c.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_f4ca411f206749bb8a3753005586c0b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/jingle_bells_sheet_music_for_trumpet.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 4928 bytes
SHA-256: 0daae0396ea5d2415f00de10101900bf4d5935329fa1b16ff9a92b72819c4a1f
font_01_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 13140 bytes
SHA-256: f23da53f5d992ba75bbe13ceec7ac79f22175c4ffbd8d0732e859917cc5b3905