Malicious PDF — malware analysis report

Static analysis result for SHA-256 c833b3d531d96d37…

MALICIOUS

PDF

79.8 KB Created: 2021-04-01 21:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6eb6ce3a3802de277e08d0f0ddd8f29 SHA-1: 00f2eb70b346205529e854dc5a6f4bb90788c7b1 SHA-256: c833b3d531d96d37894254e0991488ec51be82a395296d99bcff0f869d8e762a
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-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://zajinet.ru/123?utm_term=antenatal+scan+report+format PDF link annotation
    • https://cdn.sqhk.co/leperanurosi/iggi7Zl/equalizer_2_soundtrack_artists.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/f0b3d1410dc.pdfIn PDF document text
    • https://cdn.sqhk.co/lasukojizix/hcahejg/kanto_power_release_date.pdfIn PDF document text
    • http://leomannapov.com/angular_new_date_format_yyyy-_mm-_dd01j9g.pdfIn PDF document text
    • https://rigafefabapamum.weebly.com/uploads/1/3/4/4/134486683/mijegidi.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/oNhbjho/bigezoninidemukufojuzab.pdfIn PDF document text
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/gozabamog_jajupile.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/d3Neggg/gezifirosuxugadesu.pdfIn PDF document text
    • http://samo-katim.ru/big_book_pages_86_88dlk01.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/ljdgf0j/dutufonusafodebulo.pdfIn PDF document text
    • http://alisabor.design/how_to_open_graco_fastaction_stroller2azu0.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/7a6b8dc3-b753-489a-a3d9-34c8e564c60d/american_history_x_movie_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04397c7-fa06-49bb-9cb2-0f25cb4593a7/89820288436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2a2b38-2b1a-4521-9c8d-78bea27079cb/negative_binomial_glmms_in_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422ff3c1-fddf-4f0f-9d24-55bd78bbd16d/9919321984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99db5f10-d272-4544-a3a4-97aaa250fe75/63056929589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2682c442-61c4-4324-b1b1-013a62f28a93/what_is_communication_skills_in_medical_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4035e120-cc4d-494b-9c45-3f2a9e7a385a/7985523831.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_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 5152 bytes
SHA-256: 377b8a5c51c82d31adac3f39b1c4530b64d26161bd00ef0e29770ea953e52f4c
font_01_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 10604 bytes
SHA-256: 19d5a505f6276884bf43a11d22626c4097fc510f0e71af97a11203bac98a0d72

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