Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2708b2d215d63b0…

MALICIOUS

PDF

74.2 KB Created: 2021-04-24 14:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-07-15
MD5: 248eac44bbf8be28e827f4dcc29b5a50 SHA-1: 2105aa9b497d86f8a6f7fd1084c5cb3c1da6b92b SHA-256: d2708b2d215d63b0c7568ee7ed2bf8bd684e477e907359188b7e4cae7590d9aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a phishing or malware distribution attempt, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=how+do+u+know+if+your+apple+watch+is+waterproof
    • https://cdn-cms.f-static.net/uploads/4497685/normal_6013cae33a47c.pdf
    • https://cdn-cms.f-static.net/uploads/4410191/normal_605d5ac6b700e.pdf
    • https://cdn-cms.f-static.net/uploads/4368962/normal_60328cc57e6d9.pdf
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fc9965326df7.pdf
    • http://rawoxaxevog.mygamesonline.org/american_literature_association_2019_program.pdf
    • http://antonioit.space/16451868981863fi.pdf
    • http://paxezot.getenjoyment.net/fujokepovaxe.pdf
    • http://idealica-ufficialeitalia.website/black_desert_horse_courser_guidemmmqx.pdf
    • http://meriline.store/telehealth_services_definedukz8h.pdf
    • http://sukutoxuwurif.mywebcommunity.org/o_poder_da_cabala_download.pdf
    • https://cdn-cms.f-static.net/uploads/4465400/normal_600f21d393018.pdf
    • https://cdn-cms.f-static.net/uploads/4467298/normal_605876c359961.pdf
    • https://cdn-cms.f-static.net/uploads/4480182/normal_600fd91a7aa31.pdf
    • http://tapozifokun.mywebcommunity.org/wetuxotonoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bugenerefajujus.atwebpages.com/telecharger_les_blagues_de_toto.pdf
    • http://jubogaju.atwebpages.com/andres_oppenheimer_libro_basta_de_historias.pdf
    • http://wenares.myartsonline.com/al_quran_malaysia.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_c8fc96a73ebd44c6acfb899f4de3dbd0.pdf?index=true
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_9ffadc4309ca403bb3ccf193b32e2489.pdf?index=true
    • http://wobanunep.myartsonline.com/how_do_you_calculate_flow_rate_through_a_pipe.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_off0000e45d.bin
5f59d82f8ea47e8148a94d6bdda1635eaa7d571a28d7716f135ee6fdb7b14d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 5464 bytes
font_01_sfnt_off0000f705.bin
eaecde9c35ea19aacbad796da68f54ea9210f758aefe7a398cbc8eda1b5e3c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10624 bytes

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