Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced50caebc6a3b90…

MALICIOUS

PDF

80.0 KB Created: 2021-04-24 10:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5cd47cfbfa0db4c0092422c3b8af6d18 SHA-1: d8571a3a1d3099acf27cd75f2908da8e2153a809 SHA-256: ced50caebc6a3b901724f3b2b053f5293f804d4276e4584aa3f279226cf49118
146 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 0.9991

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 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://bologen.ru/strik?utm_term=how+to+contact+the+mail+recovery+center PDF link annotation
    • https://fijitedutim.weebly.com/uploads/1/3/1/1/131164269/jegelaka_zoloruxoreb.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/niwodo-jovuzapofo-luris.pdfIn PDF document text
    • https://logikepuni.weebly.com/uploads/1/3/4/4/134459966/wovemesomafa_zijuwobilipo_zepovobabej.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/b3126d81.pdfIn PDF document text
    • https://zofekumu.weebly.com/uploads/1/3/4/7/134741387/doteputama.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/ZhgZigq/9341840048.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/moxikagetapuradugifo.pdfIn PDF document text
    • https://terokusaf.weebly.com/uploads/1/3/5/3/135347070/7ea309cfc.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/berutovuwusifiba.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/the_little_book_of_common_sense_investing_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/iieE0RR/jungle_adventure_park_lago_di_garda.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/iijivaE/94360085259.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/alain_badiou_libros.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/5f0f900.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/dDlggif/gorem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/504df63e-85d5-4368-b18d-26c8cfb3c5c6/how_to_transfer_mini_dv_video_to_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a8afa0-c539-4947-af73-567f6036a4ca/how_to_set_up_blue_clean_power_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee5c478-ab58-47e4-82d8-0b23cfc04031/dr_wahl_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e6bed7-72d4-41fc-b7e1-582f4ee8350a/pulobuguvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded499c2-4659-4408-8564-2fabf9da774e/nogajoruvepulada.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/ageism_in_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5157216e-b3f2-4190-9779-bcaaf3ab2a10/how_to_manage_your_time_as_a_student.pdfIn PDF document text
    • http://lopafulobitap.atwebpages.com/accounts_payable_interview_questions_in_deloitte.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 4864 bytes
SHA-256: b530766b8416a4db9d50ad8ba8ac47f03ab785db2b823206a314ced05e79b270
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10824 bytes
SHA-256: 8d3e1d75ac3639aeca4ab49c898cd5f9f318b5ccb6c02a00a645c5bff31839d0
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378