Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b59fc2a8eeb3f0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 20:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: baa0c889d7936bf2d9be9db74f21d46e SHA-1: 1c84f2e71f74ad779919f1d92580bb0df3a99080 SHA-256: a3b59fc2a8eeb3f0994a7499f7cbbe61ea649c66df1cf2e05ce7399157794a4f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=how+to+set+clock+on+pioneer+car+stereo+wma%252Fmp3 PDF link annotation
    • https://cdn.sqhk.co/lofakekaf/8QgjijT/99815838533.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/gwjachb/10160862792.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/YhbiKCj/41503801446.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/rhgbo5v/tigexorudenijutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_777a7fa10e434b849643b100a03fb0b5.pdf?index=trueIn PDF document text
    • http://tokafibalo.epizy.com/kigidimixuvo.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_33eec9d0161e415f96faabcdc21647e5.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_64c8d431a42045119e66a157a7e75d5d.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_5fd4c10dbca64b958a5737f96ff37ab4.pdf?index=trueIn PDF document text
    • http://sasomibaben.rf.gd/psychological_literary_criticism_definition.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_031df404c7714ebabf8c0fe61d70d2e3.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_a9cdc97b6148448f9e6f29785940156b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/24379353359.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/4liker_apk_latest_version.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_8a4aaf6329ac4b6a83ab79895f350c2a.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_4268fc6e6ae64cc1bc81f898c407731e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/bonobexu.pdfIn PDF document text
    • http://zefesuk.epizy.com/an_acceptable_loss_movie.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_61e58cc7bbe34b4a948975896cc4eb6c.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_85753cc212f94fbc9da6025978e94e38.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_42e4040a32664db1ae7905c2d56328f0.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_8f8d07ddb1a9474f8e43242f1f9cc4fe.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_d0efbd6f15fd43f68c6ecd7eaccd759e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 5396 bytes
SHA-256: f560bca31c1e2b5b441a02a036bda121d575e271d43fe2a3118feef24fc31b26
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 10932 bytes
SHA-256: 5d2cbfc714f87c139865b7585df000c4d1a418b79b214d7ddf24fcb9d63ea336

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