Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f85299f74740d25…

MALICIOUS

PDF

72.9 KB Created: 2021-04-01 08:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 832814ac91eca591059df064e0b7adef SHA-1: 1e7cef2a8375a4a3a6a306ee0d3682c56955863c SHA-256: 3f85299f74740d25b4825dccea8903c457ff06994ffde2da283b83579ccc62b4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/123?utm_term=dormakaba+annual+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484118/normal_5fd7ca101b189.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/dukoletaz_sodokur_ralufoge.pdfIn PDF document text
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/bofevuvoja.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/chhERO2/87202806235.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/jiBgcia/save_our_homes_orange_county_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/Khjjbgf/perfect_piano_software_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/mijvhiM/1weather_weather_forecast_weather_radar_alerts_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_602ad8fae791f.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/loronokixulab.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/f614a884-e858-4754-8304-21f213d772c9/whirlpool_refrigerator_water_filter_1_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5e8089-10a5-4943-8c43-08e12c1e0a45/28114579473.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/uso_de_aspirina_en_embarazo.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/9013992776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2edaed-dd4f-4bb5-91e5-13872a0ea696/how_to_give_training_to_sales_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afb6578-de7e-4cfd-9773-f38be261ab7e/lg_inverter_direct_drive_washer_top_load_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a26e72b-e2cf-4203-9feb-22c2e30078f2/fiwibeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e6af26-d658-4c2c-9667-11e5b012f33a/rokuxawesa.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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 4988 bytes
SHA-256: 9897bcf2495d40e2d05fcc23820b76e79986e0d92c7574c67fd0697e510c8977
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 11140 bytes
SHA-256: 1f9b3e04c482a72d1142a1236c2d7ac6998788043909fd4ee27ac6ed61ff5b66

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