Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab712c3ee936b20…

MALICIOUS

PDF

81.2 KB Created: 2021-05-12 05:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f7356a63c5088ad2da91739d430d9077 SHA-1: dcbd752418602af00671e63ba0641fe1549e2b69 SHA-256: 1ab712c3ee936b206d2026f026407fd1a348621a4f0fc3a13f41599c4ff83d74
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs, with a prominent one pointing to 'leonvi.ru', suggesting a redirection or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on disposable domains, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=marshall+jmp-1+footswitch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374986/normal_606ae3ab82f5f.pdfIn PDF document text
    • http://migerov.xyz/jodupojxfo8b.pdfIn PDF document text
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/sutelerixu_bumuperuv.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/chemistry_notes_for_competitive_exams_in_telugu.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fda0a7db180e.pdfIn PDF document text
    • http://fb-copyright-help-from.com/mamadelapalogewiwedikdrjz8.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/31319734638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501380/normal_6022617366e36.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/15ad346157c5.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/7213173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_605e0ff59f3a9.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/the_story_of_edgar_sawtelle_part_3_summarysi2la.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_601dbd3747bf1.pdfIn PDF document text
    • http://lazerepil.site/48345265541wsmg7.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/e9bcffd4-5572-468f-afc7-ee744261413a/criminal_lawyer_salary_chicago.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/51328523615.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/77063165324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f5c694-04d2-422d-a580-4247c9f4f9b3/dr_seuss_sleep_book_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/dir-615_default_password_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/voot_colors_tv_live_show.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/how_to_use_lasko_space_heater.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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 5512 bytes
SHA-256: ed03a00cf1c798b85622f155b66d8f546293f1826ecc4371473877447ff0d5ff
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 11844 bytes
SHA-256: 8bf2afdeb75d68eaf86ab21c0d032b505a1c8ed3842ee969fb8461d53e138629

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