Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cc5e461640c151…

MALICIOUS

PDF

97.9 KB Created: 2021-04-18 14:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8598b1fb03aaf125284735e99a6dd698 SHA-1: bdd419d921e914f2a40c1c066702d3320bceb9ed SHA-256: 33cc5e461640c151bd25895158702be3111b13fffcbd3d355fcd4579ca783988
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-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://xajibur.ru/strik?utm_term=agatha+christie%2527s+poirot+itv+series PDF link annotation
    • http://zhigina.ru/blue_and_white_air_force_ones_high_top2wshn.pdfIn PDF document text
    • http://legko.travel/what_cut_of_beef_is_used_for_steak_tartareqki6y.pdfIn PDF document text
    • http://passive-income.ru/amt_380_9mm_kurz_backup_manualrjyyi.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://repair-planshetov.ru/katevakewsvswq.pdfIn PDF document text
    • http://bt-management.website/free_modern_house_plans_south_africafgcsc.pdfIn PDF document text
    • http://dkshlyap.ru/lane_recliner_repair_diagram7fewi.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/9c62afd8-ec06-4cd4-b79f-1ccd12412150/toruxonulatofumenubisuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395fd1eb-6add-4869-a5cb-a0ce415b2558/xetixab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29aa674-0f2b-4038-be16-0b7c72db44e8/what_is_socio_economic_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d747aed3-e5ab-4ddf-8e7c-dfb7039db93b/lopizupozenubesas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba3260b-9a0b-44d7-85a2-03ca246fc920/lozikexivu.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/81521060444.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/20450675077.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/polaris_magnum_425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785dd895-08c6-459b-9d34-4db461f7189d/neato_botvac_d7_black_friday_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9466b36a-1a01-4fef-a707-128bfa5246b1/power_of_a_praying_wife_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/new_2019_toyota_camry_se_for_sale_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/ruxixoko.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_off000140f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 5244 bytes
SHA-256: 980ccfa1aee912fa2f6f4e0b83ac0cf824027a639ea3f78b7d5b653cf1438c8d
font_01_sfnt_off000152db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DB 11796 bytes
SHA-256: 562a11ee1066af2bb5661b98647fdf79480a2f81c887346e401db0f1dcbb8dc2

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