Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda56638bf9663cc…

MALICIOUS

PDF

75.8 KB Created: 2021-04-19 09:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a9c0cda9227ebf44f35a7eca200a0dd SHA-1: 745f580d67ff12fee010b1210c89c121dfbb0fd3 SHA-256: bda56638bf9663ccd817db90bd35a233025e78cae3765dc37401f45f4e346db4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=shadowrun+bioware+list PDF link annotation
    • https://cdn.sqhk.co/puxezuxivas/giIUe5d/26904476525.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/jYjjTFv/72459807655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_60661b76b3495.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/zotewimofolazujix.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/pbjchiA/95473034197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_60445c3cb50b7.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/hbjbBPR/samsung_notes_update_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sesakiwewe/ym0Tjfa/dabukiwijol.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/majgiaY/life_simulator_unblocked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/hiST3dv/30085551798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_600d356c05fa8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_e2eade13e2324332b9af70fa43773fce.pdf?index=trueIn PDF document text
    • http://jopuvirul.epizy.com/magisterium_book_3.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_485fbfb637dd4dffa70325ab67fc545c.pdf?index=trueIn PDF document text
    • http://varupasasadutab.rf.gd/allanson_transformer_2744.pdfIn PDF document text
    • http://talifox.rf.gd/apkpure_car_games.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_b82fcbd524554afd9d52472402a832da.pdf?index=trueIn PDF document text
    • http://notalopelovawu.epizy.com/spiderman_3_ppsspp_highly_compressed.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_41cdf113c64745a6a217e903cee79384.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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 5248 bytes
SHA-256: c53d95eb67d416974737d8d81efe8e5445b8793a83ccc377a09f8ba51590bc0a
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10752 bytes
SHA-256: b43bdf35c17a82a6deaf99f6eeecbe470b735668af268ba8d7b7f80454c46a0f

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