Malicious PDF — malware analysis report

Static analysis result for SHA-256 170eab8de1aedc60…

MALICIOUS

PDF

80.5 KB Created: 2021-04-06 18:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1b3a503c59242eeb6d2593268764bc1 SHA-1: 105a4e2a71444152ff3dbae7f9b710f20df5c414 SHA-256: 170eab8de1aedc608f2c3d16f249ea14f4df7804fd730e32c0ec53b4628c83f1
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-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.
  • 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://lozipotod.ru/award?keyword=carnegie+learning+algebra+1+teacher+s+book+pdf PDF link annotation
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/sozatokedasov.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/solid_geometric_figures.pdfIn PDF document text
    • http://nowexevor.iblogger.org/bijurixunuvul.pdfIn PDF document text
    • http://reestr.site/jarewodobenezagoxafunowbmmza.pdfIn PDF document text
    • http://modernstyle.pro/rosario_dela_preciossima_sangre_de_nuestro_seor_jesucristoos94q.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/budget_2020_highlights_income_tax.pdfIn PDF document text
    • http://wasodez.22web.org/47818787260.pdfIn PDF document text
    • http://lnstagram-office.com/how_to_keep_track_of_stock_tradestjp0a.pdfIn PDF document text
    • http://grenkasalo4.xyz/60440197962226q.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/jonixitatemojej_fefafe.pdfIn PDF document text
    • http://titanovyi-filtr.ru/5282890635586hzo.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/38ea0d28-5980-41e1-bbbd-7a00373e6d15/how_to_cite_internet_sources_in_apa_without_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d75a62-4a83-4a85-aad8-4464cc3a7ee3/why_is_my_new_lg_refrigerator_not_cooling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c70a433-f1c4-445a-b7bd-1c13ff4ace3b/how_do_you_know_if_your_stove_has_a_pilot_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad13312f-9377-4498-9757-5524ba7dfcbe/61603846056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7200410-9b0e-4d41-92c5-692025dfaa4d/82400139535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01103afc-cc24-4021-b0ed-66fedd793477/best_quality_boombox_cd_player.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_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 5580 bytes
SHA-256: a9d1760b4584821a7f52f2c783d1fc663096a0d15232bd8ab582ccdfca3c0521
font_01_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 10372 bytes
SHA-256: 58e198b8bc32f094cc9d45c7ae387ae8fa3c9068c5031094c2d914c871131c40

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