Malicious PDF — malware analysis report

Static analysis result for SHA-256 762a39d7d48afd14…

MALICIOUS

PDF

68.2 KB Created: 2020-11-09 20:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e43425076380b004479ec77de3a9a707 SHA-1: 9850a98b7f136c5d2d2f26aca6e5ca4eb3d60cb7 SHA-256: 762a39d7d48afd14c64e8f53ab786e8f352c2c134ea69c26e36a4fda6aaa2532
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, including a suspicious URL hosted on 'trafffi.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Why I Write by Joan Didion', aiming to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/123?keyword=why+i+write+by+joan+didion+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5f95faa6d4fde.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/6473001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_5fa65ebf22e4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d18c260a-e45d-415f-ac7e-ad126166ab48/zupivezoduluxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d31ae5-b072-4681-893f-d16e04c1d517/39306790346.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/temodomanagibazudumelitak.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/what_are_ethical_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240b1e43-0ec8-48fe-a2b2-0c80874ac5d8/outlook.com_sign_up_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258c6a5e-a838-432f-9a48-a194af84d07a/88363320674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ebddf5-b441-4fa5-97ec-54019fee2709/76915169748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82fead2-bca5-4047-a444-3299784c056b/zisesegewejufupunivotebod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6e2579-b269-4ca7-9fb9-666962c6f90b/texas_dps_driver_license_manual_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6f002b-b3a7-4aa2-b893-81e79e784357/mujavonigewetapigik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2851f7af-e3cd-4717-89c7-2b3d64e078fc/luligutolupa.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 5336 bytes
SHA-256: 8503f323bf67eab7b4b33301c42d37d27433de3e632403f8fca6be5992c6bbfd
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 9924 bytes
SHA-256: a865c8fb3e984ca1fedc3c030c255b2be11c219884d7b8c9523c5ed458385c6d
font_02_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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