Malicious PDF — malware analysis report

Static analysis result for SHA-256 898b0ae70f148f8d…

MALICIOUS

PDF

87.7 KB Created: 2021-04-05 12:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a737394db15caacf95ed942747a61bc7 SHA-1: a4b12ed6fa3a5fa4748ef9c5fe8e2b3124fe3f63 SHA-256: 898b0ae70f148f8dd3c5ca7b81f7eb347a35c5a5827e43437fc215d6b8696541
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the heuristic firings suggest the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=vineland+iii+descriptors In PDF document text
    • https://cdn.sqhk.co/dabebasavus/RuifScu/86777728921.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/brA7ibF/gumball_game_child.pdfIn PDF document text
    • http://shortsomfj.space/boy_in_striped_pajamas_summary_chapter_7dajro.pdfIn PDF document text
    • http://shoop-fm.ru/graphing_inequalities_practice_worksheet_answer_key17rap.pdfIn PDF document text
    • http://komikewewi.iblogger.org/free_bb_trumpet_sheet_music.pdfIn PDF document text
    • http://onkoprofi.ru/34543176413zz3pr.pdfIn PDF document text
    • http://tehnotop.space/5047323439pqesf.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/m5jhheb/nifena.pdfIn PDF document text
    • https://cdn.sqhk.co/volinafi/dPihiac/azar_ta_hilesi_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/ijjhUha/7720102110.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/iCgghc5/uc_browser_turbo_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/iajfi2P/95769605476.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/DahjygB/bizatakalesesamevubidom.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/64281c2c-7a0b-450c-a059-d3c1c798f515/what_is_the_history_of_hong_kong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4add3207-4e72-426e-9aa5-571a892e7d93/real_estate_certification_near_me.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/bubasobuwimogitonovogogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff25f33c-2fb0-4c22-bb50-112436aa88c4/judith_butler_quotes_from_gender_trouble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73114a5a-1af1-4460-a8fd-8eea308b4685/1-1000_number_chart_and_words.pdfIn PDF document text
    • http://sisedatumunamo.epizy.com/jumukusipiwulezasizevoru.pdfIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_23aba111bfb0465393d25ed141b6e94a.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_1ae90c91a7874ad8967ebbc7dfb0e2f1.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_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 5032 bytes
SHA-256: 97204c79ab0be81d457186598ec3e084f6daea6f85468b25bd10128640c2129c
font_01_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 12000 bytes
SHA-256: 22d507eaab2576245f8acbef945e70490e3f09ef713f43dac9e2d4086ed6221e