Malicious PDF — malware analysis report

Static analysis result for SHA-256 e191bf09d3973d94…

MALICIOUS

PDF

75.9 KB Created: 2021-06-09 06:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8dcfca5778b6131faba3badbcfec7018 SHA-1: e42b705fa9b07c06c81250c7d5ab79b85f71a868 SHA-256: e191bf09d3973d94dd21469c4c62f2fbb4189b6ee2a4054b3acb6025d4500cbd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and includes a UTM term suggesting a search engine optimization or phishing lure for 'Archicad 23 download'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://philabc.ru/pbw?utm_term=archicad+23+download+free+full+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414701/normal_60bdfb55c860b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5ff66e5959902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60bfe0fae6317.pdfIn PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/63256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_603ea6cd7a53e.pdfIn PDF document text
    • https://zideloxilatomi.weebly.com/uploads/1/3/5/3/135325243/7bcbbc984990d5.pdfIn PDF document text
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/5167333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418762/normal_5ff84552c0b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_605f6ad73573c.pdfIn PDF document text
    • https://pujapuvefebawu.weebly.com/uploads/1/3/4/5/134581836/2133273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_602ca5c77097a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_602625b1dffe8.pdfIn PDF document text
    • https://ruvazokof.weebly.com/uploads/1/3/4/0/134040659/jumavapimok-xorojekabu.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/fivok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_602d7e2625e87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144413382/arabic_calligraphy_font_generator_free.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420123/piramuxudilawijomemom.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/29777264226.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/rangers_apprentice_book_13_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd069ce1-0e61-49ba-acb2-cab512ba0d67/why_the_book_of_enoch_was_taken_out_of_the_bible.pdfIn PDF document text
    • http://rozeluf.pbworks.com/w/file/fetch/144642312/39520634633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6585d654-2696-4e35-be10-42fe332a297f/how_to_get_student_discount_on_tinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7a3aad-922f-4330-b450-2eed79040442/how_to_descale_nespresso_delonghi_lattissima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2105d7b-231f-4736-a3b1-84929ecb4a77/what_is_rational-emotive_behavior_therapy.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_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 5548 bytes
SHA-256: 118fba530b1dd72c6ff6a5789cadbcb9eec4b6b9ab137516bdeaa18a95510d39
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 11128 bytes
SHA-256: bc974c525328be839065b3bd9e80f63bfbee63140082283e33b890eb80118e8c