Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c2d321e26bf243…

MALICIOUS

PDF

93.5 KB Created: 2021-03-18 00:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4b4f574d4ec9dfef9e1f96ad28188ad SHA-1: 22e3b8a790bcd0b822bf445c31816b3158ef30b8 SHA-256: 82c2d321e26bf243d6f43b779a171c3952bb287aa08637f718532cf15ad32345
214 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or link farm attempt. The document body, though heavily obfuscated, contains text related to 'TOEFL test dates 2020 PDF', suggesting a lure to attract users interested in such information. The presence of numerous external URIs, many pointing to disposable hosting, indicates a link farm designed to redirect users to potentially malicious sites. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://golowaki.ru/award?keyword=toefl+test+dates+2020+pdf PDF link annotation
    • http://talemine.getenjoyment.net/jesiwolinojumumane.pdfIn PDF document text
    • http://tizezs.xyz/arcsin_arccos_arctan_coursqv5un.pdfIn PDF document text
    • http://bcipreactivaperu.com/53228823666o7xjq.pdfIn PDF document text
    • http://texno3ua.com/464697580868wikh.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/91368007899.pdfIn PDF document text
    • http://choosenews.space/best_electronic_music_production_equipmenthlq4z.pdfIn PDF document text
    • http://sodahub.pro/86119731011hokro.pdfIn PDF document text
    • http://acupofjacob.com/4213273730zia8k.pdfIn PDF document text
    • http://creamspait.xyz/nordictrack_c2255_partsav549.pdfIn PDF document text
    • http://goodsun.space/siwosubobipizuviwjk8he.pdfIn PDF document text
    • http://santaparker.store/mathematics_textbook_for_class_6_has_320_pages95ct1.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/e515d2fb-f33f-49b1-acba-022b0e435443/xofagufukev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72816bf5-52cb-4be4-9e7d-b6bed4e07fee/what_does_an_autopsy_report_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11260fef-b206-4df6-bfa7-e568d73f31e9/livobenixux.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_dfa7a931c2eb402b874ebbbf822883ba.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_7c6098859e6144e3b74c79f5b6ac2906.pdf?index=trueIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_eaabfd0806b64cb1b09a85d9276699d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12a1030-f86a-4930-90c4-2a7ec47ed705/is_fasting_just_a_fad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e2edf8-5d34-4bb1-9a26-927047d5db38/25858597860.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_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 5164 bytes
SHA-256: 58e3a6f5accf95c6c4de79805f7fb5eb49b571a9b6dac0b19d3dce958bb0631e
font_01_sfnt_off00014107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14107 11780 bytes
SHA-256: a7d8be27baad4ab2fc440063da60683c00825402dc1ee75d8df99cdf856c87ca

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