Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffda84b286ba2ad…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 07:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5a0c9bd5b071ee0c3627b1280d2bba7a SHA-1: 5246cbecec8d68fac70b724feddb64c0386ed556 SHA-256: 6ffda84b286ba2adbc30579439e9a71e2610ae8a6181693320e1deb6a195cfa3
206 Risk Score

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. It uses a callback-phone (TOAD) lure. 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 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botokaw.ru/strik?utm_term=intermatic+timer+motor+wg1573-5 PDF link annotation
    • https://cdn.sqhk.co/xedaberetaj/ig2jeMN/38283632147.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/EGWgi7h/zurolasigodix.pdfIn PDF document text
    • http://santecmb-sarl.com/oppo_font_indonesia_apkn5kqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_603ab7ec2195d.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/hfBJLhe/46636816864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_602ed1f95235d.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/bEhaChb/tails_os_raspberry_pi_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_601252e6e63ce.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/azorin_obras.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/jygezro/road_warrior_animal_on_hawks_death.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/jQifOji/viewbug_photography_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/sbJhei3/ps4_second_screen_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bubarozotuj/EIgjajf/microsoft_word_operating_agreement_template.pdfIn PDF document text
    • http://dhl-order.info/40481115107wffw0.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/tesotegifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_504f4228088f469b9d368af7eb6ec232.pdf?index=trueIn PDF document text
    • http://romakilax.myartsonline.com/ante_nicene_fathers_volume_10.pdfIn PDF document text
    • http://bobixupeto.myartsonline.com/jasitub.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/catholic_mass_songs_lyrics_and_chords.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_21c22770b74d464a9f15df50473e3fca.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_2bc41077c42c4c53a3572d7845c7b478.pdf?index=trueIn 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_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 5388 bytes
SHA-256: 8ead8326386fa37e510068afcdb68dfcaa4a3ce729035250adddcbb1675d19ae
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 10932 bytes
SHA-256: 740de79d18d1572c6a794c05d619e55a697df972ab817110dd048262255dece1