Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf66c5909bf8ee10…

MALICIOUS

PDF

81.3 KB Created: 2021-01-18 08:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4f98dd937d64c15eb717239eaec4b36a SHA-1: 7ce90c7e1fae7fda672bac9ed811a015e90e1092 SHA-256: bf66c5909bf8ee1099ee03912e0200f2ecd7c7b4b3f57f1ce009954d40ec12bf
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'conceptual physics textbook pdf', a common lure for phishing or malware distribution. The presence of numerous links and the ML classifier's high confidence further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?utm_term=conceptual+physics+textbook+pdf In PDF document text
    • https://site-1198644.mozfiles.com/files/1198644/58023553362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476437/normal_5fa70bf663497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5fb2762822fb2.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/hidden_objects_in_pictures_with_answers.pdfIn PDF document text
    • https://site-1183169.mozfiles.com/files/1183169/34132281274.pdfIn PDF document text
    • https://site-1176683.mozfiles.com/files/1176683/66850794865.pdfIn PDF document text
    • https://site-1188771.mozfiles.com/files/1188771/ziritexafuxatape.pdfIn PDF document text
    • https://site-1166701.mozfiles.com/files/1166701/destiny_2_forsaken_weapons_guide.pdfIn PDF document text
    • https://site-1171487.mozfiles.com/files/1171487/megofilewelizemoxuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapopododo.rf.gd/46486838384.pdfIn PDF document text
    • http://wajiletum.epizy.com/tik_tok_video_without_watermark.pdfIn PDF document text
    • http://sabinozugi.epizy.com/55416838046.pdfIn PDF document text
    • http://temomij.epizy.com/24053608156.pdfIn PDF document text
    • https://s3.amazonaws.com/gozega/86716799674.pdfIn PDF document text
    • http://tobobuximalusu.epizy.com/xufijad.pdfIn PDF document text
    • http://rusuxagek.rf.gd/bootstrap_modal_form_angularjs.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 5424 bytes
SHA-256: cfc04fb3ca9f23ed833f14238c866be03cc660afe947e1321075d902e9457856
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 1852 bytes
SHA-256: 7f1fc89d230b21cdf1c6da576e651cd8d1038c1fc087e797b2b55c3b3618ee60
font_02_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 15412 bytes
SHA-256: 59f8e02bd32cfc9d98555e9ec0743e97f64c99ad3a87f28ff8216b0b45d36f9b

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