Malicious PDF — malware analysis report

Static analysis result for SHA-256 50955c152fa8930e…

MALICIOUS

PDF

77.2 KB Created: 2021-04-26 17:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76ff0580c0a71eb4f3c9f359ec15690b SHA-1: 917be5ad525fef5ab0d160a99536636bc2119e31 SHA-256: 50955c152fa8930e29ee99f2cb4f91853e50e1cbd42f09b10a37f4a19135aadc
66 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 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 0.9991

Heuristics 4

  • 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://dugedepap.ru/strik?utm_term=formato+de+avaluo+catastral PDF link annotation
    • http://bestrongbyg.com/are_ikea_pans_oven_safecc1hb.pdfIn PDF document text
    • http://sale-siberian-force.online/best_construction_safety_certifications0jswt.pdfIn PDF document text
    • http://shoppingyxplus.xyz/western_unimount_plow_mount_heightk9c2k.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/veromobowive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fc80efe2f85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6021d16858ed1.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/8901741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_600aa160ec46b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5ff2bfbb3c356.pdfIn PDF document text
    • http://xenotobewaf.22web.org/50430313896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_606b0a1e1cf20.pdfIn PDF document text
    • https://kolagigeb.weebly.com/uploads/1/3/2/7/132741023/bd313c3d3f24c9d.pdfIn PDF document text
    • http://milesnires.xyz/lopexj85yw.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/basic_company_profile_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fe56d43cfe49.pdfIn PDF document text
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/ae38352af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_601e8655447a8.pdfIn PDF document text
    • https://rixesibajarij.weebly.com/uploads/1/3/4/7/134712387/8915533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravuxigud.epizy.com/chitralahari_telugu_video_songs.pdfIn PDF document text
    • http://pujusojup.epizy.com/farewell_email_to_colleague_template.pdfIn PDF document text
    • http://wolodavufaxus.rf.gd/essentials_of_biostatistics_in_public_health_2nd_edition.pdfIn PDF document text
    • http://duvexarido.epizy.com/88814375089.pdfIn PDF document text
    • http://vuvugifew.rf.gd/olympus_om10_film_camera_review.pdfIn PDF document text
    • http://xivoxek.epizy.com/2008_nissan_sentra_reset_service_engine_light.pdfIn PDF document text
    • http://baverasoge.epizy.com/32470221262.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_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 5100 bytes
SHA-256: c3d4304e954319820063ccdc2a9397a8e5cfdb56373782acf9afb613877bcb86
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 12032 bytes
SHA-256: 17c7ce29965c91f9cf1622187e9209cc36884e3147ddfe7ef9596508731f2906

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