Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2a5fe675595249…

MALICIOUS

PDF

75.4 KB Created: 2021-01-24 20:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aea8ae1577728dcd6a5f10c20a9f3d9c SHA-1: fdf4a2ffabe9bf615f5011ff921734995198967d SHA-256: fd2a5fe67559524959dd8bca3a3198924e2e892723bb15d4bb94f213b9ac5feb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting a link farm or phishing attempt, with one prominent URL being https://seumenha.ru/aws?utm_term=law+manual+pdf. Although no scripts were explicitly extracted, the presence of PDF-specific heuristics like PDF_SEO_LINK_FARM and PDF_URI strongly suggests the document is designed to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/aws?utm_term=law+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5ff5becd84701.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/fipinafepidujakizuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413702/normal_5fed374526d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5fcc8d12b507b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458628/normal_5feef19ab336b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ff47aa8849ae.pdfIn PDF document text
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/nomaxejuti.pdfIn PDF document text
    • https://rukururage.weebly.com/uploads/1/3/0/9/130968917/jisesazere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489730/normal_5ffe076097d35.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/dILgiEv/share_it_web_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5ffeb50c84134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406169/normal_5ffdc9688839c.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/nitirew/baby_borning_videos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/canada_food_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/blueskysea_mini_0906_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/gizixasuwoxogemexufisi.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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 4472 bytes
SHA-256: 413eca44e29c86de63f930ebe49c36e71638210e09f1155109389a35d9bed010
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 11220 bytes
SHA-256: a06c051b44672daf8f2f979bef9a9853fc6656dab16f011399b5710bdf229717
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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