Malicious PDF — malware analysis report

Static analysis result for SHA-256 78906f0fef31d755…

MALICIOUS

PDF

80.6 KB Created: 2021-05-25 06:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aaceafe332fad4428777881e51962bb5 SHA-1: 4ff7c13730bdae6ba3525fcc62c7871163ea4946 SHA-256: 78906f0fef31d7559f3d5ae150fbdf644b22531a5651b1166707191dae5f8225
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=how+to+clean+bissell+proheat+2x+after+use PDF link annotation
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/e8eb26121.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/782b41769.pdfIn PDF document text
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/8777536.pdfIn PDF document text
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/0fbe1c8f81a.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/85efcead24c.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/a68ea134f6.pdfIn PDF document text
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/janutor.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/ddf71933-0993-4975-ae84-63fa97379f64/65035137127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df491573-1041-4368-902b-a5333029bc89/jageta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c948d23f-aeca-46af-beee-64747c926f48/busufavikomoxaved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb6de1c-80be-45cf-8f31-3532fe774352/spalding_basketball_system_assembly_tutorial_and_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154bd3e9-3391-4fe9-80be-0a943bde01ab/bunojoduxiramizanokigir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a5282a-b17a-4f36-b9db-470d01892ff9/7854088068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937fbcc5-b533-4c9e-a157-90b318cc2513/best_astronomy_app_for_iphone_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4e9a8e-8416-48a0-adca-6384668ada35/no_homework_pass_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f8336b-419b-4395-b1c4-475dbd81ea6c/60501715581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bef46e5-d7b2-4ffb-bf50-303cf7d00bc6/johann_gutenberg_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/88291496640.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/diary_of_a_submissive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a190a9-30fa-42b3-b8bb-9842aa426c63/odd_thomas_movie_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/tatigufexewivaziwafig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0e8983-00e2-47b2-b495-d155f63ed901/58013068044.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_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 5496 bytes
SHA-256: 153fb4ebf3c7eeab4adf7c0d094900b7ddfaaba89d52ba1de457faa096cef03c
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 11000 bytes
SHA-256: 659fbce0d2204bdee037f26d392cf87c90aaf5de13fa9b256e657bca9266735c