Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5de667aa989190…

MALICIOUS

PDF

85.2 KB Created: 2021-02-22 14:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 543774b2575688912ad5d670ed2cd2b6 SHA-1: a06c92e4ca2e37c069c3205aba8b562b36f57519 SHA-256: ca5de667aa989190092765ddb00ebdc0c0cdd7ed64f70c433f512c6cce115a7a
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick the user into clicking the link. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the presence of a malicious URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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
  • 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/123?utm_term=urge+basics+soundbrick In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_602c7fe7c9437.pdfIn PDF document text
    • http://keysecret.ru/logb_personality_test_online3rbe6.pdfIn PDF document text
    • https://cdn.sqhk.co/wikepijosipi/ijfhgMo/juvojigolulaxizovos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_602282bce42e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_6030319a5db61.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/gidgcgg/93917510607.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
    • http://natexaz.rf.gd/japanese_walk_out_of_league_of_nations.pdfIn PDF document text
    • http://makowadoka.epizy.com/how_to_layer_images_in_cricut_design_space.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/hungry_shark_evolution_android_2._3._6.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/vk_kapoor_medicinal_chemistry_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/business_letter_format_in_word.pdfIn PDF document text
    • http://miwofalixi.rf.gd/cdphp_managed_medicaid_prior_authorization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/android_scale_bitmap_to_imageview.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/85416686847.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 5072 bytes
SHA-256: 0008688d68f53a6381bbef93ec33c0becc67f4f3b8b1384a9325946fcd2ce8e9
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 12492 bytes
SHA-256: dd93f2a5907687ad2bb68996738db746679efa90f2d100f8cfd1c26067489ad4
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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