Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36dc45d67877140…

MALICIOUS

PDF

71.8 KB Created: 2021-02-13 16:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1a8c09e19da18d7cb6c5569a896fe021 SHA-1: 1bc14cc27912600ee441976a8dc3fe00039aebbc SHA-256: a36dc45d6787714091d529dc8e8621c39651386f37a3f830f4e1491563046d61
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-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://druttle.ru/123?utm_term=who+does+boxer+represent+in+animal+farm PDF link annotation
    • http://missunik.space/67950705106h4hwx.pdfIn PDF document text
    • http://exemplpusj.com/1942_mobile_mod_apk_unlimited_gems_download9a8iv.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/7109528.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/fIzuoKQ/download_alarm_anti_theft_lock_screen.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/3907484.pdfIn PDF document text
    • http://iblack.space/948633588959e9g4.pdfIn PDF document text
    • https://legipulevigo.weebly.com/uploads/1/3/2/6/132695741/3871534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408583/normal_5ff7d6206b1f1.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/UhgPiab/us_army_paintball_ops_fps_shooting_games_unblocked.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/04b0f5eb4ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_6027a7eb0b4ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe4bb1b50b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_60123869c07b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_60230f73d89bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fd779cec8727.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/investigative_report_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/cd_dvd_windows_7_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/stremio_apk_android_4._4._2.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5500 bytes
SHA-256: 5b85124aebdee26e5e891bdf43d16470d247c9561121e5c39789191f3aaf46d6
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 10444 bytes
SHA-256: cfc4a2f7f7283d6954dedcd7a6a676bb0a55f6da0a23dbebe1671dcbf940df15

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