Malicious PDF — malware analysis report

Static analysis result for SHA-256 570ef1743546c78b…

MALICIOUS

PDF

78.3 KB Created: 2021-06-09 16:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1498c52baaabea655a9821de6241771e SHA-1: 8e759f062e0683de63166071701df789570d7e02 SHA-256: 570ef1743546c78b053858c2681144ef45bdf67d0bdff43ee106951c053060cd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=follow+up+email+template+after+proposal PDF link annotation
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/929486.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/jijizupar.pdfIn PDF document text
    • https://gabudusufixojur.weebly.com/uploads/1/3/5/3/135339303/zujin.pdfIn PDF document text
    • https://medefidonirefej.weebly.com/uploads/1/3/5/3/135324812/dasataxoz-waforelox-sakuduvunom.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/xinurumuwetida-xixaxowad-zolos.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/d1991a.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/03f02e.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://ridelox.pbworks.com/f/free_battle_royale_fire_force_game.pdfIn PDF document text
    • http://gupipax.pbworks.com/w/file/fetch/144897270/my_very_own_pottery_wheel_instructions.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144619926/75532328876.pdfIn PDF document text
    • http://voveras.pbworks.com/w/file/fetch/144747504/99476580388.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/how_to_retrieve_deleted_photos_from_memory_card_free_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13303973-ec57-45dc-b5fa-1e483960c2f4/77958582035.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/60948557383.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/dejong_neurological_examination_8th_edition_free.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144786954/78810749573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c25bf2-be42-443f-9c3f-65915fb82c18/33173620975.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/w/file/fetch/144413796/80242083762.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 4872 bytes
SHA-256: 4a21b3b358f18ec706fed0f8cc70f9d3e84a0e9ff3b5814d01b957ec5e45417b
font_01_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 10640 bytes
SHA-256: c953d2385782fcafe53349e00a8c5660f9fd03b4a7e864168016c9d86b5e5e02
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333