Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6a9520fd736bc1…

MALICIOUS

PDF

74.3 KB Created: 2021-02-18 16:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 4977cacd28b3c11702a27f8e16d9f472 SHA-1: 5a44d17ab9b3ebbbe62209c8b2b6f9b17d18c5b0 SHA-256: eb6a9520fd736bc1412c19f0f00e330b243d9c13c7a86cf3b8f8d9c29201c2f1
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as downloadable PDF documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF_SEO_LINK_FARM heuristic indicate the document is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=alphabet+phonics+sounds+chart+printable PDF link annotation
    • http://detaxinema.22web.org/saturation_knee_point_of_current_transformer.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/jfkhgwE/lijebapuwijan.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/wopatanowuxitoj.pdfIn PDF document text
    • https://tipolapuponawog.weebly.com/uploads/1/3/2/6/132696210/a07f591f24c8.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/viiiegf/47806175669.pdfIn PDF document text
    • http://raliwoze.iblogger.org/mappila_album_songs_mp4.pdfIn PDF document text
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/bobenixitirow.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/miaShfT/53782914870.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/juwagomekopuxuwexep.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/3jcZhic/jojoxuvoximulet.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/gjhfXjc/jaxovuxowikilodi.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/EHzheED/iphone_emergency_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jczieJp/chop_chop_define.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://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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 5172 bytes
SHA-256: 8079b3cf37292d133e6d803d228b18933f2fcb8fad07b634a13fa077c6eb7209
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 10768 bytes
SHA-256: e631136e7710fd0551a8ae461220d60f0693dc4326e5661d57661af1b5a3ef4d
font_02_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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