Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1e6f69160a3251…

MALICIOUS

PDF

67.5 KB Created: 2021-03-17 23:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4e647e7594a84970050e29d0f09d390d SHA-1: 2f4d82e8429f0a86cb3347fcdc4db937e18e85fa SHA-256: 3a1e6f69160a32511212c748f8c2f89f43f9b1cf6ec69afbc2cc5e8a2eaa58cf
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'abacus worksheets for beginners pdf', directing users to suspicious domains. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://jacksth.ru/award?keyword=abacus+worksheets+for+beginners+pdf PDF link annotation
    • http://zasaluto.iblogger.org/invitation_templates_for_baby_shower_boy.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/logipizabizo_wopobegupo_maxitewojitat.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/wuzilevo.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/zerevuloxa.pdfIn PDF document text
    • https://wibizoginoj.weebly.com/uploads/1/3/2/6/132681485/zetezijesutimimeb.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/3254855.pdfIn PDF document text
    • https://kesobimagebow.weebly.com/uploads/1/3/5/9/135978915/xejisisasiwesefofim.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/burisute.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/6242590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/sapiwosepizejuwefuvoseva.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/zukizesobepirafi.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/sample_balance_sheet_and_income_statement._xls.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/formation_pour_chef_d_quipe_de_nettoyage.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/83872536773.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/78132646943.pdfIn PDF document text
    • http://tanamumejoxa.epizy.com/sat_practice_test_7_writing_and_language_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/does_king_arthur_really_die_in_seven_deadly_sins.pdfIn PDF document text
    • http://gorevifero.epizy.com/dosegofofurimazex.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/total_conquest_apk_unlimited_crown.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/photography_background_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/cuales_son_los_5_fundamentos_del_voleibol.pdfIn PDF document text
    • http://mokowiwar.rf.gd/adjectives_to_describe_people_s_physical_appearance.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/68049233346.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_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 5672 bytes
SHA-256: e16c5c962d673fcd941fa58392de59dcf49a5e5ff99af874baf2969527b4a047
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10164 bytes
SHA-256: 51eebf50da464ceb0fc6ee646bb9310ffd7d2eb5b26831fb82a0539290cc6fb8

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