Malicious PDF — malware analysis report

Static analysis result for SHA-256 551eae5da4054895…

MALICIOUS

PDF

65.6 KB Created: 2020-12-15 16:25:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a7cffc21b2582288d2b202ff7e6d102b SHA-1: 53a7d6e84a70e2d209dcc2ebdd75c02b6d834835 SHA-256: 551eae5da40548950e422fe461b0a0e5e2e38934edf6185ef2c1452ceb2921f7
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, identified as a link farm. One prominent URL, "https://traffine.ru/strik?utm_term=big+pocono+state+park+trails", is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=big+pocono+state+park+trails In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_5fd13d2a3626b.pdfIn PDF document text
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/bolos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5fa23843f1982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fd1e137bd9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fbd12a25e821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_5fb4eaee404d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_5f9a5b27988aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5fa31eeed1ead.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/dadupawo/apocalpticos_integrados.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6fc0db2e29c7ba9914c52/t/5fc9d0bf2f5dbb44b77ce7d5/1607061695388/45778590536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93668c9-35aa-4235-bfa5-f753013048b7/fegivexejidigubosavemozi.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_off0000c2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 5216 bytes
SHA-256: 05adb0ac5a49cb78ebf8d1df660bd5120c5e7c119a83d57dd6859a140f9e8f05
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 10844 bytes
SHA-256: 879b2213ec0f649b89f9d17c7fd4348e5c19ac34c6d6924e65514c2e5ad2f3a3

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