Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e34a4c63fc695…

MALICIOUS

PDF

68.6 KB Created: 2020-12-16 14:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f522c9be26e797673b06da270976255d SHA-1: 83c73bd5bf4a7174fda65e7da12c5e6f22a01063 SHA-256: f51e34a4c63fc69524c1f6a5a7c6148298c50dca9e3ea984586a831d44fbcdf0
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a PDF link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains keywords related to invoices and payment, aligning with the 'SE_INVOICE_LURE' heuristic. The primary attack vector appears to be tricking users into clicking embedded URLs, which likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://traffking.ru/123?utm_term=britney+spears+concert+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_5fd78cde167f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f89ca7085130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5fb3307969c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5f9707bb1ff2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_5f9d2b871014e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5fad947853487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5fa162c02862d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5f8d6927b0bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5fa1fe4219af1.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/2980210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5fc6c0a8eb7d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liluvad/bemba_english_dictionary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6f0e41969b523a41dae17/t/5fd5f54f154d727871e0764a/1607857489649/14314914138.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33c8d68612547ed6d2293/t/5fcb00d81415195da07dcdac/1607139544847/84488350242.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf157b7ee8e70759d48e3/1606218073026/losor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e925ea4a794d56451110/t/5fc75b219dfc2a40451e8955/1606900514197/razer_laptop_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/asbab_al_nuzul.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_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 5320 bytes
SHA-256: aa8dee54d3fc3aa87902aae2c5a9bc7838cd7e84c7ed8ceed905f9fd35bba44c
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10936 bytes
SHA-256: 7e123cad0d5c3f579a06b19768268b5de28a8f7a64ded385be2711117c2160d5

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