Malicious PDF — malware analysis report

Static analysis result for SHA-256 de101ff1bc8a1d21…

MALICIOUS

PDF

69.5 KB Created: 2021-01-19 05:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: bbe36c6f8bbe098426b529118fdd4976 SHA-1: ca0be1e7c23871099ca8668d56a6e599bb331e9e SHA-256: de101ff1bc8a1d214a31a9cd4f9cf6e83c62f7e5cf7c74716bc172a2034cd526
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://bologen.ru/123?utm_term=my+boy+gba+emulator+apk+mod', appears to be a lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7734

Heuristics 5

  • 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
  • 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://bologen.ru/123?utm_term=my+boy+gba+emulator+apk+mod PDF link annotation
    • https://site-1241428.mozfiles.com/files/1241428/aspekto_ng_pandiwa_worksheets_grade_7.pdfIn PDF document text
    • https://mopopapepiror.weebly.com/uploads/1/3/2/7/132741339/8578772.pdfIn PDF document text
    • https://site-1175696.mozfiles.com/files/1175696/lijulaxutepefavejasid.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/8216671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_5fae942f97eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f9b0c654c4b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fc66e5e4335c.pdfIn PDF document text
    • https://site-1173429.mozfiles.com/files/1173429/46820429709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_5fb96fc8518dd.pdfIn PDF document text
    • https://site-1197825.mozfiles.com/files/1197825/desurimavun.pdfIn PDF document text
    • https://site-1174627.mozfiles.com/files/1174627/gipelugomijale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fb2e24434d74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepapemifen.epizy.com/vizab.pdfIn PDF document text
    • http://dopuviboxew.rf.gd/face_report_incident.pdfIn PDF document text
    • http://zekumom.epizy.com/messenger_lite_app_play_store.pdfIn 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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 5140 bytes
SHA-256: be5b035e5fc8e031bb4f3a776f53a812696176fb4f15aae675712535a2a4108e
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 3024 bytes
SHA-256: cf5ed4f450e5fc1fa31c8ac31b5dbd05637a4ba05cdfa332ae769b600578e534
font_02_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10684 bytes
SHA-256: 135f946d3c8fc997a35a463fb298aa5d79fc0acf9b882485ed25e9ecab1ed6bf

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