Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2221b0e24bef0c4…

MALICIOUS

PDF

85.5 KB Created: 2021-03-20 02:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 66192b861e1ba8692cadc243d021f7a2 SHA-1: 746864af8498ee4ee7c3edd6bfe09b4f1751e530 SHA-256: f2221b0e24bef0c4335965c4405432f777889a06d39f9e06d70b95e883ecc621
186 Risk Score

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 0.9996

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://leonvi.ru/123?utm_term=argentina+facts+and+information PDF link annotation
    • http://cashbackmoney.info/gonajifibubowuxibesize4nn22.pdfIn PDF document text
    • http://brumbum3.xyz/19005732798xa6ya.pdfIn PDF document text
    • http://hookup681.site/walt_whitman_high_school_ny_class_of_1970gjv9d.pdfIn PDF document text
    • http://starkrobotics.org/witireratewo7pj1a.pdfIn PDF document text
    • http://legalvictory.group/66279465942twivm.pdfIn PDF document text
    • https://xigizimevavas.weebly.com/uploads/1/3/5/9/135982966/6c622d9febd.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/tisufixatonigus.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/e7f23e.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/66444732649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d6f1f11c-1a97-4767-b52e-b18c5a1351f6/war_and_peace_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83932576-7266-43bc-b479-736ec93fe12c/law_of_property_and_easement_bare_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f45fc13-67d0-40e9-8034-c26eecdf7e56/8658376685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a137ad8-ca11-4e00-bcf9-dc717abbdbdf/statement_of_faith_examples_for_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c4a03a-0f41-4eae-a49f-b80aeccbf265/does_windows_10_come_in_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d3e5d6-86ca-4962-a938-b28dcfbdc2db/basic_crochet_stitches_uk_diagram.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/2020_19_spelling_bee_word_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3461115f-e358-462d-92df-44d6adb651c3/how_to_find_angle_of_right_triangle_given_one_side.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eba0310-c7ac-467c-b108-4aa8a7d3f0d4/production_and_operations_analysis_7th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ea21b3-bd67-429e-99e2-27dc1668be6b/saeco_odea_go_test_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fe8d3f-6abf-4f69-9d30-b937eecc8723/wevutarulutexatom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419a81bc-7de3-4f44-b790-fcd281ed7e07/72807395582.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 5088 bytes
SHA-256: 5115b0085eeab7d12b0ccf8b64fb8107ae201d2c73843867e485f869f39ed41d
font_01_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 11448 bytes
SHA-256: a7a703ac1c6ee311839582aebb2513ce04812dfb236e151c6f3a3c81901e4bda
font_02_sfnt_off00013a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176