Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6957108dadfbd5b…

MALICIOUS

PDF

81.6 KB Created: 2021-03-29 18:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c4856650a0e83ca6615eb2a31b9a1d4 SHA-1: b0ebe4bde13f8d00948454fa07362e26e1012735 SHA-256: d6957108dadfbd5b1681a2629e54beb7050e76cd0887ce967de333b28cc4d4ee
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to contain metadata related to its generation, but no clear user-facing text. No scripts were extracted, but the heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a strong intent to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=go+math+grade+2+chapter+1+lesson+2 PDF link annotation
    • http://swiss-family.space/sagakugawawotavojuzottn.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/eriguhi/accomplishment_report_for_ojt.pdfIn PDF document text
    • http://arendaavto.taxi/dwarf_fortress_how_to_legends_modegy3us.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/rudefevegasuxexate.pdfIn PDF document text
    • https://cdn.sqhk.co/rupelesegeb/ahcgjS0/filter_power_bi_report.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/aerospike_database_a_complete_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/jhcSSon/16000837063.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/h1die6J/mosagufurul.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hcMxjbc/vositigetejarad.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ShbRVgf/newest_iphone_se.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/dmJq9Nz/sonic_the_hedgehog_movie_super_smash_bros_ultimate.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/0eJibhj/fishing_cashing_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lagexodefajo/jgevgeB/wazudawixudibewu.pdfIn PDF document text
    • http://lordtrans.ru/online_english_learning_classes_in_indiaanf4t.pdfIn PDF document text
    • https://cdn.sqhk.co/lelitojo/LKhhhgg/tuxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/CYj5whi/game_stickers_for_wall.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/7geg8Co/surgical_anatomy_of_the_hand_schmidt.pdfIn PDF document text
    • http://sayseedokg.com/80870187899ss5oe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/af31a90c-1f46-4d2c-86df-c58abfa06f21/lisaliwoxulonalovekop.pdfIn PDF document text
    • http://tofalit.myartsonline.com/3356047663.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/imax_b6_digital_rc_lipo_nimh_battery_balance_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81f4a94-0e00-43e5-8a64-e1198147356b/70105203992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c604f4f1-f80a-463f-8e68-ce42dc7d7691/calories_in_el_pollo_loco_chicken_bowl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c937e8b-9462-401e-8319-b9340984177e/35331313986.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 5440 bytes
SHA-256: da3843a74cfd3e58f4b4e4917168469cd0d9d02ec6a8302708289996d3407d0f
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 11216 bytes
SHA-256: 2b4c9ad987ef9897c1e9c5e9fd23f4d5b751deee2add6927b1d16c56d00134c2
font_02_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d
font_03_sfnt_off00012a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3