Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9e74dc637ce00e…

MALICIOUS

PDF

81.8 KB Created: 2021-01-17 14:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bcf1c4e0b64cb8ca8f56242792b21fa7 SHA-1: 5b5a41c052467bd79b5421612819c2753d7c69bf SHA-256: 5a9e74dc637ce00edfb736576df1738c5de4260ea55226abec60cb203b0f7340
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and part of a link farm. The primary URL, 'https://traffine.ru/aws?utm_term=cerebral+vascular+malformation+mri', is flagged as a malicious redirector. The sample also exhibits characteristics of a phishing lure by presenting itself as a document related to medical information, while actually distributing links to other PDFs.

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.
  • 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.
  • 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://traffine.ru/aws?utm_term=cerebral+vascular+malformation+mri In PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5ffd4e6942116.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/jgaHjaR/godulumugul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5fbb08b1f4173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_5f9a5c5024126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8d8d23dd00e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5faa0bd6de681.pdfIn PDF document text
    • https://site-1172681.mozfiles.com/files/1172681/39771987981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f97d42007c96.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/hrSieuH/movistar_play_app_mexico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5fbe613d43498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5ff7c5f8a9e7f.pdfIn PDF document text
    • https://wopirizebopate.weebly.com/uploads/1/3/1/4/131452778/kogalupatadilesarol.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://tozibuxadotoba.epizy.com/1534655061.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 5132 bytes
SHA-256: a86f04cb818748436b64318a6ccba6a9c5890f15364c6001170240f103b29500
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 11044 bytes
SHA-256: ab51729a5c5b0ed322b96fe57aadf825437621a213b41b79295042b1b47e658f
font_02_sfnt_off00012bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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