Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e70db541ea673a…

MALICIOUS

PDF

78.0 KB Created: 2021-03-08 02:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f57321325d2c705373d9430024a68653 SHA-1: b8480d1664fe95f20b574113067eac4b6ff26976 SHA-256: e6e70db541ea673a95615eb5e29b877e11d035306f3b28e245fb467771bf79cb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the lure for users to click on external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/wix?keyword=insurgent+full+book+pdf PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/4UeUITj/battery_tender_jump_starter_instructions.pdfIn PDF document text
    • http://kuliwajijet.22web.org/jasper_report_java_11.pdfIn PDF document text
    • https://vudegerolo.weebly.com/uploads/1/3/1/4/131452783/bidopawovomowo.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/gV58ew7/zexiwopag.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/PSjbiew/xivap.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/furizakusino.pdfIn PDF document text
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/pobej.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/jgdMhjW/16546346353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_3382b646b4734257b45aa77ce0ebbfd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52adadd3-8147-49e6-a772-30de75365e34/suunto_ambit2_replacement_strap.pdfIn PDF document text
    • http://muparokaxewidad.rf.gd/xakafejakubupaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c214ff0-17dc-4b11-937e-1c0b5e3a6d6e/what_is_an_example_of_a_data_warehouse.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/finding_area_of_irregular_shapes_worksheet.pdfIn PDF document text
    • http://bavubuseji.epizy.com/94425506548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c922fa-1b78-44cf-a0f5-f34f13c6f0f3/how_do_variable_speed_pumps_work.pdfIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_04ffab9da0ca4a78a36625927173e158.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_9485f6c0482148f08cea078fa31cd3b1.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_8764649e0fd34f05a3cb82d6a6a81ea7.pdf?index=trueIn PDF document text
    • http://binalidagu.epizy.com/best_bible_study_guide_for_beginners.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_972736f82a0742279b4a6a3b6127adff.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_d80aa3d28f5944dd955bd852b46a2962.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ecf429-b49b-4e52-919a-923a47bbae9a/how_big_can_a_carry_on_be_on_allegiant.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_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 5140 bytes
SHA-256: 229e9d506ee6966842793f3ca794e239757243515691a2ac5e1e86e8c5a44aef
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 10148 bytes
SHA-256: 19ee511ba7e4b5bd655b55d0bdd3fa3dd9339563d96a8779773239c15247564c