Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f62daa7276ae92…

MALICIOUS

PDF

73.8 KB Created: 2021-02-27 02:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a2299f705d7dfa689f23c80df2226da7 SHA-1: 7bbd16daeb85aad287facb5d3fb4d2f597d4e63c SHA-256: e4f62daa7276ae923e992c5c6fe5b4c65c88fd9e42618ae4e38ef0f69a6a4c70
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=7+days+of+a+week+in+french PDF link annotation
    • http://mapotilij.mygamesonline.org/98393597289.pdfIn PDF document text
    • http://fixadazopirutus.22web.org/sodastream_source_elements_starter_pack.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/city_of_madison_waste_drop_off_badger_road.pdfIn PDF document text
    • http://forpost-electrica.ru/different_types_of_beaks_and_feet_of_birdsj2iz4.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/iiE6jgM/32772109686.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/HficjbD/game_of_thrones_beyond_the_walltm_apk.pdfIn PDF document text
    • http://olivamebel.com/dinedomavuziwovekui6ymp.pdfIn PDF document text
    • http://gutaferu.22web.org/79770324689.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/9fe370c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/lobifojijo.pdfIn PDF document text
    • http://vilojuwomujup.epizy.com/shirt_size_guide_us.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/65615992607.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/kopafof.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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 5320 bytes
SHA-256: 4cc28ad046b570741f64e4aab608d3ffec2d39184c064a2e51ba9e469f193551
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 11468 bytes
SHA-256: 59fce748ca58b9eed078d91d79b977680e47d222cc8120498c04b9678e90fbbd

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