Malicious PDF — malware analysis report

Static analysis result for SHA-256 504a9fbbc448ca97…

MALICIOUS

PDF

85.1 KB Created: 2021-03-07 11:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: be26a1c2ae6e9277365521241471b8fd SHA-1: 9bbf0ee48ef510aba2915d4449c23a98244575d4 SHA-256: 504a9fbbc448ca97646972891ccadb5a1a09d3440e2634de0bb222ea1f402b5d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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 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.
  • 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=transfer+function+of+field+controlled+dc+motor+pdf In PDF document text
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/fefowokobo-zomefo-dugilusu-folapuzabato.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/6554916.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/gifuvoxuf.pdfIn PDF document text
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/8075422.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/bc1e013.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/icthbid/78155279346.pdfIn PDF document text
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/58029e18.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/taking_sides_clashing_views_in_abnormal_psychology.pdfIn PDF document text
    • http://dsv-trening.ru/takuravepusijonire1d9fx.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/912002147583cq5s.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/haigEdN/wovidulimat.pdfIn PDF document text
    • https://lifefazat.weebly.com/uploads/1/3/4/7/134742259/6387011.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/fajugafijurapasalulju53l.pdfIn PDF document text
    • https://cdn.sqhk.co/selugijibix/u9zgiC8/gibatopinujilikasorevu.pdfIn PDF document text
    • http://trenketo.buzz/td_cheque_number_formatel28u.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/zzig5nQ/brazilian_carnival_city_crossword.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/hFVszib/77218457544.pdfIn PDF document text
    • https://kopujigok.weebly.com/uploads/1/3/4/8/134862339/4057320.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/Pieidje/gugoguveruwexamuguxudi.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/what_is_meant_by_validity_and_reliability_of_research_instrument.pdfIn PDF document text
    • http://triple-doska6.club/formato_pago_impuesto_alquiler_sunat56rlf.pdfIn PDF document text
    • https://siverogafexuj.weebly.com/uploads/1/3/4/0/134012696/34d6c5c4f7b1c4.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/rujeten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kulebosux.myartsonline.com/mutoli.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 5132 bytes
SHA-256: 799e6ad4513c0f097bdda60bd40137dc5c66394529a160a96898a8a692dfc966
font_01_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10932 bytes
SHA-256: c6cb2e0c578300dad37266881f92a2a612029e70be3143c6266e242c4d2bd760
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16568 bytes
SHA-256: 6d9d14a122f43f791e2f02addd79f5167b3318cde20f91b90777c90fe9be71ee
font_03_sfnt_off00013743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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