Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c884dd78452e41…

MALICIOUS

PDF

78.6 KB Created: 2021-04-23 00:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ad2053fbe85cf68f854cde930db28aa8 SHA-1: 20c31b8545d623c01af23bec3cc71ab0f45f9936 SHA-256: 40c884dd78452e41f7935626eb866f848af51f234b55fc713bb4fffb2a989e61
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 hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=kiffe+kiffe+demain+meaning PDF link annotation
    • https://cdn.sqhk.co/sudidoxa/hchdjib/31548533404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_601bdd5adb4a6.pdfIn PDF document text
    • https://cdn.sqhk.co/xibexowufifu/ieW2iaZ/64651889770.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/Zdgogfn/anime_live_wallpaper_hd_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_6068faa0eda1a.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/Uidijwy/my_3_top_up_uk.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/d023147c-e69d-42ed-9c33-36281a580e3e/restaurant_general_manager_jobs_in_mumbai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05340885-ea04-4782-bc14-f013c07aeda3/rinnai_water_heater_part_gtk15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eec498a-59b1-4dad-92aa-f6fa54e6923c/data_communications_and_networking_by_behrouz_a_forouzan_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df2190e-b2d4-47d8-a120-bba8ec5442d4/tutijage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d1bb68b-6921-4c6d-a07d-635f3097e918/how_do_i_get_windows_10_for_free_in_2020.pdfIn PDF document text
    • http://sepinolet.epizy.com/bomulogazesinurud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb62656-0c02-40a3-a00d-b91ab51b2ff4/how_to_tell_reading_level_of_a_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fd44b9-4007-4362-91c5-a4e9cc1457dc/salux.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_9e20f8fc67144b1c86dec5203c8ef4fd.pdf?index=trueIn PDF document text
    • http://rodobokojezaga.epizy.com/dyslipidemia_guidelines_2016_pocket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0ddda0-3150-42ec-869d-d64af5a43b94/31095683583.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_ac107843f95849c8af3d685f8cb9cf84.pdf?index=trueIn PDF document text
    • http://jizipok.rf.gd/infarctus_du_myocarde_gratuit.pdfIn PDF document text
    • http://jokezonuwekuj.rf.gd/self_driving_cars_technology.pdfIn PDF document text
    • http://zowiseli.epizy.com/64207910224.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_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 4956 bytes
SHA-256: c05524fcb3afb705b64e9d5eabe90df1914b23d445ee44c61506e1290115ff47
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 11660 bytes
SHA-256: ba907f33f2de95e15bd5efb248d064a47de09dbe7704e1777b0cef8299337d66