Malicious PDF — malware analysis report

Static analysis result for SHA-256 549833576e6b527a…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 16:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3ce115d5df2d6736176d0e44344a3965 SHA-1: 53d660b8b75259a2bc4ae135c7429c4896de1622 SHA-256: 549833576e6b527a7c2607f42d18ad2b7f79e2e72a727d94fde1c65bfefe6dbf
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 0.9996

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 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://mezovuduw.ru/strik?utm_term=omron+h3cr+manual+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499329/normal_6038fd40b7f25.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/wja0jeb/formal_letter_to_state_representative.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60144be0c9d9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5feaf93dcf456.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/76044639295.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/jbhbKjf/vimetuzuragibuja.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowaguka/djhghj1/bezasanalenisinakiriruve.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/93190457692.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/97699377395.pdfIn PDF document text
    • http://guronid.mygamesonline.org/pathophysiology_of_typhoid_fever.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/winegard_carryout_g2_power_inserter.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/iA6cWE5/tozuzosafekal.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/reflexive_and_indefinite_pronouns_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6011e638d86f4.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/23005027230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudazebej.atwebpages.com/silabus_biologi_sma_kelas_xi_ktsp.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/toefl_itp_reading_comprehension.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/87018447878.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/ashoka_movie_moviescounter.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/reading_comprehension_exercises_with_answers_grade_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/vesigikemozizadigi.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/fedloan_wont_let_me_sign_in.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 5800 bytes
SHA-256: 3bce072b6d6479a1d5e00ddd5a53569ceab36cf51daef0c33b71ac9576ce5ce7
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 11824 bytes
SHA-256: 699332dec37010446c37e4328504923501361f4aa891d4c3bcdbed6308f2979f

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