Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae674bb3d10ea594…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 15:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac9d5c6f841a97c9867ae10c01602094 SHA-1: 3de2fe4a2e209a8a0705cc3b1e6f3f465b35d8b8 SHA-256: ae674bb3d10ea594d06c754502443960384e7fe735b22b1e164d4a3a1d2100db
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=queens+grant+community+school+jobs PDF link annotation
    • https://cdn.sqhk.co/dejuxafe/6I1PF4Y/kobe_wallpaper_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/hhhZNRT/21684993763.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/1gh8nhh/what_is_the_most_holy_city_of_christianity.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/tepusumelusozenexifa.pdfIn PDF document text
    • http://circleshtang.xyz/how_to_start_a_new_paragraph_in_excel0oopl.pdfIn PDF document text
    • http://scarcebook.com/869344583645lxua.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/jhhikDE/steam_pro_software_free_download.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/b8b9f.pdfIn PDF document text
    • http://makamar.online/pathfinder_2nd_edition_class_guideskw13j.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/ihhghe5/84775812165.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/57004702470.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/saxememisesuburub.pdfIn PDF document text
    • http://brettlockhart.com/vadereridulpje7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda5af4a-1260-4089-93b6-3a8f3cc1cfb5/dunkin_donuts_138_stockbridge_ga.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_8737e9941ce5428f9b32a07ac0f3a029.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_0b58e4be32144c37ab3eaabab762b177.pdf?index=trueIn PDF document text
    • https://104cdeb5-cbd2-40ec-bb4c-cb5680d889f1.filesusr.com/ugd/9b2d9b_cebd6fac944346dbb38995ed8896e88e.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_130807100f1749039e35ada38a32b1ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3068e30-0025-4b3a-8d61-2011a0d4e73c/lozurubokukejukabofemimi.pdfIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_eed363de4fb14b54ad673405689629df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/135818e6-d278-4538-8fa3-cd7a9f036a2e/is_bram_stokers_dracula_a_horror_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99e9e45-9847-4d83-9ccb-c4ef7ec3af06/que_es_un_problema_de_investigacion_ejemplos.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_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 5592 bytes
SHA-256: 1cff63dca6d866219bad4599b17dfa661671d3d14da8e6e221a05e6504bc49e9
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10440 bytes
SHA-256: cbc42eb76635ec715586227eca8489014b5ca6b166f9739fa4af5071dc5f5d82