Malicious PDF — malware analysis report

Static analysis result for SHA-256 2526dde72f5b75a2…

MALICIOUS

PDF

75.5 KB Created: 2021-04-11 01:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 946ce85065c0ae33336ebcb0c511b71e SHA-1: cde5e62e988cf314ff039e7384c17a5f28611672 SHA-256: 2526dde72f5b75a2968c1afe054a4d8ff9eb152417eac4eafa72f7888c13607c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://xezojetit.ru/strik?utm_term=hard+origami+instructions+pdf
    • http://mesanezedid.mypressonline.com/makurisa.pdf
    • http://mebovedu.getenjoyment.net/90473296763.pdf
    • http://lubenoredeji.mypressonline.com/zofotejujunep.pdf
    • http://pet-guru.shop/sword_of_truth_terry_goodkindf5atk.pdf
    • http://pobadabodoz.scienceontheweb.net/building_iphone_apps_with_html_css_and_javascript.pdf
    • https://duzonaxur.weebly.com/uploads/1/3/4/0/134012347/subujifiw.pdf
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/2724217.pdf
    • http://vulufinagi.mypressonline.com/calculus_concepts_and_contexts_by_james_stewart_4th_edition.pdf
    • https://guxenakab.weebly.com/uploads/1/3/5/3/135393472/9132ee.pdf
    • http://siankaanmexico.com/wetadevugefofupipomorexuga9rrt.pdf
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/4d9d8a.pdf
    • http://fulifubajamo.mywebcommunity.org/canada_study_visa_form.pdf
    • http://daating19.site/16006930097vuwxx.pdf
    • http://manovina.mypressonline.com/5376961221.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2b9946d9-0d35-4f19-816a-be3a053e6e38/48891512756.pdf
    • https://uploads.strikinglycdn.com/files/d9a5ce33-8592-405d-9df4-3f01d3a13187/tidunof.pdf
    • https://uploads.strikinglycdn.com/files/6e57843d-7472-482d-8af8-c4ecfe7c156a/90583701036.pdf
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_a0087c53ab67405bab957021351ba69f.pdf?index=true
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_7dfbc134fbda4578a44a39918128c76b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0849e89e-e76b-4ff9-9297-25d0e5a48152/how_to_write_an_expository_essay_in_apa_format.pdf
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_4f1c3e978f3042d8b8172d77cda3bcbe.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_86b7bc849c2d44068b2a43b88dc41e5f.pdf?index=true
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_28292882b474422986622b27905e6d07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12bc97d4-389d-48be-8f34-97e7498bc91d/35729564534.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e883.bin
e51d6683734705509c4f7f0eac3a8cc12d6be53fad7e94c348879070fe89017a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 5404 bytes
font_01_sfnt_off0000fad3.bin
83bd82fb8f9f07cc220be8211ba5a6a187cac38ce3897ab0e0d0c317f9b3acef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 11136 bytes

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