Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab8d69a7ed5078f…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 13:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c86183780807e4d86144d8c8917cacf0 SHA-1: c6fc55b43458f83250f64fad2820f99a343f4e11 SHA-256: 5ab8d69a7ed5078f95a298aae8b2cb4fafd1f43ef86d6edc21e0056da314ee5c
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 0.9997

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://botokaw.ru/wix?keyword=ain%2527t+gonna+jump+no+more+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487399/normal_5ffb461465349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_604ecc34e57cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5fee43ab009af.pdfIn PDF document text
    • http://gafowegane.iblogger.org/xetiledu.pdfIn PDF document text
    • http://xolorodabo.22web.org/toastmasters_how_to_listen_effectively.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_60185621c7b53.pdfIn PDF document text
    • http://sozetil.66ghz.com/63565754700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_2c10e69cb8374e6d96e5fe3249a26152.pdf?index=trueIn PDF document text
    • http://kikadof.epizy.com/aws_certified_solutions_architect_professional_book.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_3e79e72f2af7416282593052c33f94d7.pdf?index=trueIn PDF document text
    • https://3c31dc6e-14a3-4e60-a373-897e90814001.filesusr.com/ugd/9e17d8_adec3207dd994d95b4f866c25dbbd9d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1bd22c-8007-4149-bd4d-43b95cc880ed/zixumafizuji.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/sweden_flag_android_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d4feaa-dbb1-481f-8f05-4cea3fbc2b18/55181483705.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_fe62621f83a34712a9345e13ff2c1f59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/vosekudajebe.pdfIn PDF document text
    • http://xexotoj.epizy.com/servicenow_certification_dumps.pdfIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_3b5af912efb54278882ca3c4fd9a8fed.pdf?index=trueIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_89129f2fc02e42ebba05daa7c23bdf44.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_a96f68b880c0485ead7bdbd12e56f3af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roware/whatsapp_apk_for_blackberry_q10_free.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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 5452 bytes
SHA-256: cde4ca5f5107954cf75888bc893aadc93de720d17538cd53b0a2380adbaca9a1
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 10900 bytes
SHA-256: 0b2615837181b6fbfbc54737ff429c9730b920f2164a0ec3a229315010efa711