Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba54af8e23b1e593…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 09:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2f8a104cffff2e21e287eb99fde21574 SHA-1: b2942a970b179e0c6bfce6ee9709fc2319f44d14 SHA-256: ba54af8e23b1e593e5cdc3a012afec62e60d956fcf9440bb09556661dad13bb0
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 0.9997

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://baarspo.ru/wix?keyword=complementary+angles+worksheet+math+drills PDF link annotation
    • https://cdn.sqhk.co/naziwixolagu/WSQhabt/asgard_skillmaster_action_game.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/deloxipopu.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/paleguvebo/yhhhjja/72468532936.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/que_es_el_materialismo_filosofico.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/hjiagim/final_fantasy_iv_game_characters.pdfIn PDF document text
    • http://wajuxerisowo.iblogger.org/jexoxozaganasazupeped.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/bedemefabepafadat.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/6bf17f54-f25f-40cb-a3b4-77bc042fcee9/how_to_do_1.1_1.2_numbering_in_word_2010.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/81610652549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1e6185-ea96-4c93-b84d-54fad286abbf/hoover_carpet_cleaning_manual.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_c51e0571fc0d4853afd265876e9514d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0c2a2a-2029-43d3-9f5b-5c2ccae31c64/how_to_do_a_two_tailed_test_in_excel.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_8bd21e661cb14db895e70b7568935257.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db62648-d728-4dca-ac72-bf3b0506d36f/newodab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdac6562-b381-4d25-a07d-570b171444ac/aops_introduction_to_algebra_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f599fdbd-9728-4e4a-bcff-840a6337dac7/31968758787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613255f3-2592-469a-b753-06928ec7e876/fusejuxuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597d2245-2002-48bf-96d3-088b36f601c2/bash_script_if_else_string_comparison.pdfIn PDF document text
    • http://vudajerex.rf.gd/10701089742.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_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 5536 bytes
SHA-256: 119cf5796bea2220943693a3da1342e318f159bacb401f13b8899fd2169ca418
font_01_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 11640 bytes
SHA-256: 508373e364a36c6bf42f6d141b5a55f1bec3066855dd0a8da4285af986803f8c

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