Malicious PDF — malware analysis report

Static analysis result for SHA-256 3879b36fc4c6d13e…

MALICIOUS

PDF

82.3 KB Created: 2021-01-12 04:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5dff0f36327675e61b973d2be0752940 SHA-1: c678c2680dd8dc852e294939ddc3dc6ea490e8a7 SHA-256: 3879b36fc4c6d13e888ede6ac0b4d37c07cac8485fdb28404722e7d28d08747f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://traffnew.ru/123?utm_term=robert+waggoner+lucid+dreaming+gateway+to+the+inner+self+pdf PDF link annotation
    • https://site-1178836.mozfiles.com/files/1178836/zidubitol.pdfIn PDF document text
    • https://site-1177386.mozfiles.com/files/1177386/tixuvelogisaxenanid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_5fb618a09d903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_5fbc689b140fb.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/machine_robo_rescue_episode_10.pdfIn PDF document text
    • https://site-1168096.mozfiles.com/files/1168096/gibol.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/lgcjaja/77511987827.pdfIn PDF document text
    • https://site-1168049.mozfiles.com/files/1168049/famofijepokuzebeterazov.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/ihicohb/gp_sheet_weight_chart.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://s3.amazonaws.com/voxipanovigepiv/sonomiminupinok.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_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5792 bytes
SHA-256: 92b47d8ab7f4eb5f999183f19400bcb8d950be350b3e9456ca920f691d90edbb
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 11492 bytes
SHA-256: 97167b09e14a0d0697e397ab2b396296755a77ca26e8a2d4e644720b20b953b1
font_02_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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