Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9376302e29e70c1…

MALICIOUS

PDF

87.0 KB Created: 2021-02-17 16:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 70d12c115c9fce71c8274d7630c30b01 SHA-1: 0d7961cb6814483c85cabb10e5ef151dc1ec2628 SHA-256: f9376302e29e70c19d8455a9b8011beb215589b3475c49bd21705efa9def5059
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://baarspo.ru/strik?utm_term=when+is+the+breaking+bad+movie+on+netflix+uk PDF link annotation
    • https://cdn.sqhk.co/luvuxokam/jcgcvIP/goxupotufovimirirapasubo.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/Whhggb4/baxugalelepivitafi.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/xijuTyC/hackers_falls_in_pa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fdc394bd584b.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/g5oJNZD/sunday_school_action_songs_for_preschoolers.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/boney_m_greatest_hits_rar.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/cOTgnsf/apple_tv_nbc_sports_live.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/hb5ghgh/final_fantasy_tactics_pc_port.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_600b042275335.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/c04d4gj/94271094442.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/Z6WRkhb/one_piece_treasure_cruise_wiki_luffy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5fcc59875cdec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://babudenipovux.rf.gd/bengali_movie_sathi.pdfIn PDF document text
    • http://loxometos.epizy.com/kidudozekuwolu.pdfIn PDF document text
    • http://dotixoxikal.rf.gd/kadiketezuji.pdfIn PDF document text
    • http://xifenarubomes.rf.gd/bodevolugusomonizugilax.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/mapiwuserevuku.pdfIn PDF document text
    • http://kunuwinafedib.epizy.com/compendium_catechism_of_the_catholic_church.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_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 5664 bytes
SHA-256: fd6533df8f7506fda9655c7fe1b169f6fc1a2a3d8e43978e6eb560bea35bea49
font_01_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 11744 bytes
SHA-256: e1b2ac6d75220c816658332b9f4e6af07f35c94f920f79d79ef81507b2f166ec

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