Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b1a8d9f7ce85c2…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 13:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2c6f1e7bc44fa011c057dd6234b51c21 SHA-1: 5768c3a4637923c21ad9ed239d80ce0fd54a4124 SHA-256: 58b1a8d9f7ce85c280c21efef324a0f0e4f8ef7e4b087a9f6447ed814d402c20
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 0.9998

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://baarspo.ru/123?utm_term=civ+6+frederick+barbarossa+guide PDF link annotation
    • https://cdn.sqhk.co/valujoper/hht4ij5/cooking_master_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ketixudolu/DJjcZZj/joloxu.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/farmacos_bacteriostaticos_y_bactericidas.pdfIn PDF document text
    • https://cdn.sqhk.co/pawexedibib/diiidJT/7_days_survival_forest_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/jdYiehd/18913898571.pdfIn PDF document text
    • https://cdn.sqhk.co/guzupewad/NTgcnaa/jekavijodomezipabutamaf.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/mfj-939i_automatic_antenna_tuner.pdfIn PDF document text
    • http://katipef.medianewsonline.com/kixogamemev.pdfIn PDF document text
    • http://xikapajami.mypressonline.com/pdf_password_cracker_android.pdfIn PDF document text
    • http://fijazubelanulek.mywebcommunity.org/methods_of_solving_quadratic_equations.pdfIn PDF document text
    • https://cdn.sqhk.co/guletema/jajeHDq/gasopipigopuzumepox.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/fib2hfq/81210758800.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/ihiyth6/lego_marvel_super_heroes_walkthrough_part_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/every_mans_battle_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d7d4ff-a83b-402e-b22f-4c32b9984019/2004_fleetwood_pop_up_camper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0a1137-93cc-45ba-afd6-9e12a3c05755/easa_flight_and_duty_time_limitations.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/37706344219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8389b91-5c03-4a22-87e4-1a956eac3d4c/what_are_the_main_topics_in_ccna.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/zagese.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_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 5480 bytes
SHA-256: 15a69a0e7777bb0493746d2824ff60f34e1a101f582e61d39079a5af0a87fa13
font_01_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 12408 bytes
SHA-256: 040d2a1ff600acba017e19d1a876b91d743f7ac6121b502c1dbaaa26ffa1e358

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