Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b1a3d3c8768fe9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 17:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3db80ddbdc7fb4e2ad5ae328d15cb5b1 SHA-1: 3ab97d4be1093d8305038b2358ae11b50f3a9e96 SHA-256: a5b1a3d3c8768fe9587ce76bbfd9504401509207353c4804a53d3c092c52a1a9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains references to 'The shining sequel' and 'wkhtmltopdf', suggesting a lure to a malicious URL. The presence of embedded JavaScript, indicated by the T1059.007 technique, likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=the+shining+sequel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5ffa54e742f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_604f9c527b49f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_60385697dfd87.pdfIn PDF document text
    • http://frut-tree.site/partes_motor_electrico_trifasico6vruh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fe15df4938af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467030/normal_5fcef01b7f4a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_600de9aeb77a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5ff71a6972c94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5fff80c18dc03.pdfIn PDF document text
    • http://weinmvc.net/lexus_rx_350_inside_dimensionsfc3c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6031ced49c6a3.pdfIn PDF document text
    • http://lakcherie.ru/how_to_change_oil_in_john_deere_hydrostatic_transmissionto8n2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/garorowa/88368137837.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_d5a7a0c757c644049e0f98dd604e5370.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58a3034-241e-4852-9b7d-3e9b55992223/insinkerator_badger_5_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c8d414-fda6-47c1-aef2-62b0c545656d/linear_signals_and_systems_lathi_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/41135214501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d26364-01de-442d-a116-b21f1d566665/67508282223.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/61860869621.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/netgear_wgr614v10_dd-wrt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3548848-0793-4aee-a413-021fb43c7ab2/pizozusewogono.pdfIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_9fd194c6ac594076a0c6c0ec56848437.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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 4716 bytes
SHA-256: d02e973c1a114ececac97309b72b2f253688b99589238276a96a67f4753d0e84
font_01_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 10996 bytes
SHA-256: 1631002dbcfa68e9a25e0f698c3aef67f6ae4e5ad68136f8641a9f41eaa1a9c4

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