Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5219fb7f8bf240f…

MALICIOUS

PDF

75.4 KB Created: 2021-03-05 02:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d14152ab301cb7d6122b0d2cfb0b7e6d SHA-1: 18b875faa9fb7bd6447e0fc12e3efbae8821cc7f SHA-256: c5219fb7f8bf240f7f606c99a912a86b8930d4409623200eebd4f913ee09ff8a
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 domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://jacksth.ru/123?utm_term=does+the+logitech+g29+work+on+pc PDF link annotation
    • http://cleaner-inn.club/download_camtasia_studio_7_for_windowsnppc4.pdfIn PDF document text
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/8732747.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/50e29be7fa9813.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/9811817.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/ibaTbIX/jebedojomixavuxugisaf.pdfIn PDF document text
    • https://cdn.sqhk.co/xawenano/hhAlcia/love_rosie_actress_name.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/Nheja3s/45670844325.pdfIn PDF document text
    • http://stakingyfi.com/the_law_of_confession_bill_winston1546f.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/iglybEG/bear_archery_black_bear_hunter_recurve.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/CDKNjir/lowe_s_phone_number_batesville_mississippi.pdfIn PDF document text
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/bbee2.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/e2HAgiw/nafubunowug.pdfIn PDF document text
    • http://gusaluna.iblogger.org/hosanna_marcos_barrientos_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/cic2zvK/88581825419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_9b0f0ca8a54a4b11a9d640463acb6aa0.pdf?index=trueIn PDF document text
    • http://gevuraragide.rf.gd/how_to_buy_stocks_in_pre_market.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_657479b97c4440b389e30b2db4059863.pdf?index=trueIn PDF document text
    • http://sulumasofip.epizy.com/43656433476.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_b02b6ad9e9fc41148d9a4e0148b5ba63.pdf?index=trueIn PDF document text
    • http://xupudajiwozov.epizy.com/duwifefelebawiradaz.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_d193cb442c10449b82d488719d864ff7.pdf?index=trueIn PDF document text
    • http://xaboduvipil.epizy.com/temerodugewaliwifiza.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_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 5428 bytes
SHA-256: f2f1a133ed6ff4613337257fd26896ea0704269eb76dcb5bd1dbfbde91e91e29
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 10904 bytes
SHA-256: 7a80a75ec91510ffb060e9738f158b699f3aa5745b6120926b6be4aaa9041623