Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eecc3c72d61c9b…

MALICIOUS

PDF

72.5 KB Created: 2021-04-03 21:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 99f1722c1fbea5d089f98352958ddc96 SHA-1: fe63a6af51229e7696cedc1ccec31303fb59f500 SHA-256: f5eecc3c72d61c9b212b7d76f3edfaf7d75a00b8dbad9ad3ef69ebc51aca38ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL pointing to 'bologen.ru', which is flagged as a link farm on disposable hosting. This suggests a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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://bologen.ru/wix?keyword=sell+my+labradoodle+puppy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6021d05406cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_600d221da4f13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_6036657c18847.pdfIn PDF document text
    • http://bamiluzigu.mygamesonline.org/xunigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_603eacab5b866.pdfIn PDF document text
    • http://ginalupajeriw.scienceontheweb.net/63390599502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479905/normal_5fed8f947fa0b.pdfIn PDF document text
    • http://tadefog.medianewsonline.com/meteorology_terms.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/neonatal_neurological_examination.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_601fdf9c86279.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/tebalunogopaxijemivaleno.pdfIn PDF document text
    • http://xazupadapafow.mypressonline.com/binary_options_trading_basics.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/55d1ff6c-8da4-4a29-aeb7-07650c2ae751/930238482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468ff362-64af-43e6-9bca-ab47c2cac3a0/56325039916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ce31e1-6f91-4e1a-be63-d3bb40cd2e50/candlestick_chart_patterns_explained.pdfIn PDF document text
    • http://gozudivigel.epizy.com/json_format_in_notepad.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/mosejibeniwibadapu.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/atlanta_night_spots.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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 5272 bytes
SHA-256: 237aa6f3b35371e770ee6c1aca839d48d6dc3cbaf3196635c18fe97856c95a26
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 11056 bytes
SHA-256: 6a72dff6c4eb54fe4d9f6168e276f962c670ad25236b5501a8018fbfa6de0a88

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