Malicious PDF — malware analysis report

Static analysis result for SHA-256 745b90da76fbc6b2…

MALICIOUS

PDF

84.3 KB Created: 2020-11-24 17:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fd23c42bfd13b71e40438213ebd1a65e SHA-1: e6e40523f2c82802500eecdbd8b9d9ee22d3d832 SHA-256: 745b90da76fbc6b2c15378bc297017bb7f40b2cc7383653760db62d374157f7f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to the malicious URL. The presence of numerous external links suggests an attempt to lure users to potentially harmful websites.

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
  • 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://ggtraff.ru/strik?utm_term=butterfly+aviary+near+me In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f8af6c32033a.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/wopelalimabejobifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5f9bc36a959ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_5fbd0f51a749d.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://uploads.strikinglycdn.com/files/afc53a9e-8bc9-48d0-87bd-6eebdd8e3267/sovexux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80b3f44-d0e1-43a4-8fce-c18d56d04e54/dexodudurorude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5290312-1302-47c4-bd3b-99e687c6dcf8/bopafudamitozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec65536a-2863-47b6-a3a2-456a85b2590a/4457672455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5666df1-687a-44ca-ba8c-bf1872c6f5fa/chicharra_marta_gomez_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444fb275-d88f-4136-befa-7082a5f20b06/47601380612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeda76f6-15a7-4e72-98ae-d76d196bb90c/les_nouvelles_nergies_c_est_pas_sorcier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a503ba01-9bdc-45a1-87fc-bf6f9cd3cec9/zipikum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098b0074-06ac-4071-8d17-519e20992dc8/ruzosopidovaponajigixaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f646aa-6386-430a-8f10-5c03b4234626/30399182221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d54620a-4c56-4397-a0ed-3e46e7388de9/xunoxejefodebupopafilef.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_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 4716 bytes
SHA-256: 5ecc8b45d5114b5d36107ed6d32603442ad671653fbf693f0d1cc95494b525e1
font_01_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 11040 bytes
SHA-256: da7e9f5cb527a1f2c96a3c345ed0f5385057b30c9edd504a3eeaeb28953b1a0a
font_02_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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