Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fca909d8cd97a7…

MALICIOUS

PDF

80.2 KB Created: 2021-02-20 11:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9b2c23ccb5cf44f2a211818c39bb2e8d SHA-1: 35f4503f028f2678f8ac9cc1e8b64eb2003d5d6c SHA-256: c4fca909d8cd97a75071768194ba76a31a1abb8d0ccd972894337c26ca4ab7e4
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=min+etune+manual+deutsch PDF link annotation
    • https://cdn.sqhk.co/zuxosutuku/fKgfjcQ/71192737417.pdfIn PDF document text
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/4322549.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/think_before_you_speak_booksei1h.pdfIn PDF document text
    • http://apkweb.net/android_where_does_spotify_musicxrje7.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/sIihigF/barrett-_jackson_auction_company_scottsdale_2020.pdfIn PDF document text
    • http://mavitrade.com/71161634758gyqf8.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/jBhaX0y/preppers_list_of_must_haves.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/wuxex.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/iOgjha5/gatehouse_deadbolt_strike_plate.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/djjhjT8/ps_plus_monthly_games_november_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_5fda910a02022.pdfIn PDF document text
    • https://tifozofazok.weebly.com/uploads/1/3/1/3/131383738/7667409.pdfIn PDF document text
    • http://tihefers.online/did_simon_die_in_shadowhuntersbrg1b.pdfIn PDF document text
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/9d732a5d1b41.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/venunamazozuzo/android_portable_phone_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/xuxuzetokuvus.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/free_printable_ay_sound_worksheets.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_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 5088 bytes
SHA-256: 360f40bbf0ebda19cade2b08566179f26dca164a650297f1687cba27c8068edc
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10672 bytes
SHA-256: 6b77e7b5599b8176f235223154e4f4e4ae805db3472465987bdea5df7783de94

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