Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b73722f1dd5c8f1…

MALICIOUS

PDF

77.6 KB Created: 2021-01-19 17:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b44367e59ffbb173425d7ce223e0f8d2 SHA-1: eec8d353788989ab5cf8b8e911746b3c5252f478 SHA-256: 4b73722f1dd5c8f1a6c0b186a99ef651e90125d188ec5f1860871961f8e09e75
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffine.ru'. This indicates an attempt to lure the user to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=definisi+platform+adalah In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5fa7452c00451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379034/normal_60004f0eeef66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f86ff7c4f4bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fbd78d3553b3.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/emhxepi/samsung_split_system_air_conditioning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5fb8814f60047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472213/normal_60054f9b4f034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f88196e0c005.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/hcqggbD/nokipanadabuletugiz.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/4jbzghf/79677019249.pdfIn PDF document text
    • https://cdn.sqhk.co/pomodizad/cQljbha/carrot_cake_recipe_gluten_free_flour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fae5a2167754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_5fc0071296a68.pdfIn PDF document text
    • https://cdn.sqhk.co/zevukodixu/pSciiij/ruzeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5faaff4022696.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
    • https://s3.amazonaws.com/mipeboro/19879360275.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/android_bypass_proxy_for_local_addresses.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/fivadu.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5068 bytes
SHA-256: 4ba7d6cca7097bcd08fd0198f41b2d3a7f096f1142235657d23b06f3c894e66d
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 10496 bytes
SHA-256: af50253019e821eba99758a0d59332f911296eb90a005b64dc89aa6d9cd29c88
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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