Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee40ae881d904f9c…

MALICIOUS

PDF

78.8 KB Created: 2021-03-08 13:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d5e842219e15893fec12922d2affbb7a SHA-1: a25f9ae549f194ec6267822395495c7da0bb318c SHA-256: ee40ae881d904f9cc17ef17fbe9b664d5ce7c09749a9ef19367c5abbcab18059
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution campaign. The embedded URLs likely serve as lures to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=egg+launch+contest+answers PDF link annotation
    • https://cdn.sqhk.co/romekeka/eLgJMB0/wesowutolirebam.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/c8hijfp/line_segment_definition_and_example_geometry.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/hahgbsz/school_assistant_principal_jobs_near_me.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/5683d1ffa3.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/3979372.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/Eiiifje/vabidewiba.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/hajVYgd/fosibosudiwisisepumatixa.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/QjbjhpT/risk_probability_model.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/dSghhge/voice_chatting_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/4jfgjaw/5610170500.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/Ujj6Kss/zupanelad.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/2a007d43-5246-4526-96d4-88edcef9e07a/peter_drucker_management_is_doing_things_right.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_46a864ddd4304a3ab9ce0b4b96738ac1.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_7e85a2ffa0bf4cf895c871ba3b3df736.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/pdf_to_word_format_free_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/spanglish_subtitles_english.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_288f9b7b99ee4f6ebb090ed4d674c86a.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_526f85f98af64a42a52163904de20f03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f1ff70-3bc9-43fb-8955-82da44e21dab/vita_spa_hot_tub_jets.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/69145666066.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/idsa_opat_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/6th_grade_vocabulary_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a9d5ef-d2f6-40fc-b603-59877bbd45a4/tomimumujexu.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_4770597c69494718b587aceeb86513ba.pdf?index=trueIn 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_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 5112 bytes
SHA-256: 11a81fbfdc665e36f78574d5f4c0a14db77590022d14db3dccf2bcc745215e25
font_01_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 10408 bytes
SHA-256: 6f75bbe71b98a8779c87ac893fd83f725ce96bbf2046d05e69c90d4d05dccfd7

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