Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ef4b1276fecf94…

MALICIOUS

PDF

79.8 KB Created: 2021-04-04 07:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9039d8d2f0920105f48b13089e3283d SHA-1: 70d39da93fae04ec4ef9553485dc458bf681c205 SHA-256: 39ef4b1276fecf94b8095c85002431bd11a6a8a1cc82cbc64d4873796779ce74
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-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://jacksth.ru/strik?utm_term=autodesk+student+free+autocad+download PDF link annotation
    • http://limezage.scienceontheweb.net/fundamentals_of_electronic_communication_1.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/pje2hbo/dragon_ball_minecraft_modpack.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/iifLia5/botijovofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_601cc3d46304c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_6058881a6f292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5fec2431383c3.pdfIn PDF document text
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/7526376.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/46608412983.pdfIn PDF document text
    • https://cdn.sqhk.co/petebodok/ichi2jc/wamagu.pdfIn PDF document text
    • http://reduslimitalia.website/sovesuxaroto6xdf.pdfIn PDF document text
    • http://reduslimitalia.website/jafuraretidusaletevafig3snvg.pdfIn PDF document text
    • http://instasurprise.online/zajeropupikudesu51fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/motuxeneb/wSweged/rafonilunaletan.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/assessing_student_learning_outcomes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_601094b52ed29.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/civil_construction_business_plan.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/rimujalumagapefedisad.pdfIn PDF document text
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/7967148.pdfIn PDF document text
    • https://zaxonoso.weebly.com/uploads/1/3/1/3/131381259/xiwedibima.pdfIn PDF document text
    • http://smeshnoykir.space/ignou_assignment_bshf_101fk3z5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15fbf1a-a349-4780-a76c-b7958b86ca46/89875725682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8686b9-fe08-406f-ad94-4817ab6978b1/harbor_breeze_remote_kujce10712_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976c3a20-a338-4eb9-a13a-7b3308df9704/what_is_the_plot_of_a_study_in_scarlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fdb38c-13aa-45b4-a690-331dab3a415d/human_geography_ap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 5160 bytes
SHA-256: d71f8ae59422b99d1b7fccf6f76c03fb2981b2e0ba7f6ff60134779fde05b268
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 10744 bytes
SHA-256: 110180bcee95c9c9f2cb4fc2ebe4d2b531ddb1b8aa5d0942ac7594fbf0314129

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