Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa03b3712e6181da…

MALICIOUS

PDF

84.6 KB Created: 2021-04-06 21:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c6c287ab263b02164d08526350b4f1bf SHA-1: fc8232753571ba9a75dc8a7e8e2bff987a3edb7d SHA-256: aa03b3712e6181da775b55b8a488acdf20309b4c251479b5a616aa75e912cece
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure (https://yafferge.ru/strik). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords like 'Walmart ps5 games canada' suggesting a lure to entice clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 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=walmart+ps5+games+canada In PDF document text
    • http://tarekupi.scienceontheweb.net/probability_worksheet_gcse.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/idPEjhB/xuvunukuvok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_603eb956dbd36.pdfIn PDF document text
    • https://cdn.sqhk.co/fonizijodi/jdaj3gh/ballpoint_pen_refills_black.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/bha8hbc/roblox_promo_codes_2020_november.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/ifZ27gf/45834881201.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/unity_animator_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446380/normal_60082cbeb4217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447903/normal_5feb95d22f8dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5ffc0c4f3a058.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/c86a8e95-d2f2-4bed-9f91-77923d9ee3dd/81641306251.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/b._ed_syllabus.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/adaptation_and_mitigation_strategies_for_climate_change.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_fc5fa5c6353242c486fc3b27799c51c4.pdf?index=trueIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_f3230e8ba0ba4287b8fec8c9b2bc9a54.pdf?index=trueIn PDF document text
    • http://vovojoj.atwebpages.com/xavomadevujazaforub.pdfIn PDF document text
    • http://xunudijumo.myartsonline.com/98054209691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219ab256-5218-4afb-b46f-91811e653f85/what_were_the_consequences_of_the_doctrine_of_discovery.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_0288865793d0452b83f1398e8ac6fded.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_63a9aea3fdf543aea7366ac00b66fbb7.pdf?index=trueIn PDF document text
    • http://kipazafar.atwebpages.com/current_affairs_april_2020_adda247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca3e080-596b-4738-b7f2-f1800d5c908a/1497363163.pdfIn PDF document text
    • https://23fe9111-5aa3-4288-b7a4-a84c242bb647.filesusr.com/ugd/d35b85_27247a6608754ea282d9c318753fe3a3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 5160 bytes
SHA-256: cd7a988cc8d637bd137c0321c905bfac5e80267491dc44e6d686992cd71ce321
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 11540 bytes
SHA-256: e36c329c5b43fecdd45b46d094b57880f0e98bf989e7f2fdd757783063bbe5b9
font_02_sfnt_off00013693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13693 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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