Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d21be06279e6c5…

MALICIOUS

PDF

88.7 KB Created: 2021-05-11 02:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 31a568e568705c1ad586e8bbd2690224 SHA-1: 42ddd0e59fa5cd953d422842c533d166f652b234 SHA-256: d5d21be06279e6c59f024b84ed9752612320ec0c6411db27d53799638b2e7af8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The authoring application 'wkhtmltopdf' and the presence of obfuscated content in the document body further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bologen.ru/strik?utm_term=gramatica+inglesa+ejercicios+complementarios+francisco+sanchez+benedito+pdf PDF link annotation
    • http://pc-remont.website/fufufufevipononi1ge8.pdfIn PDF document text
    • https://gafonubizaragu.weebly.com/uploads/1/3/5/3/135346264/655191.pdfIn PDF document text
    • http://tomandbxof.site/digabobibaxedopomozumzmik.pdfIn PDF document text
    • http://digitalcalakk1.xyz/shemale_escorts_new_orleanslj1i9.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/f48f7be373.pdfIn PDF document text
    • http://cosmicgig.com/how_to_charge_lithium_ion_motorcycle_batteryayjk4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_60161130afef4.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/299185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_603a92c687839.pdfIn PDF document text
    • http://tozufokoxogo.22web.org/sopukatekowibatejazi.pdfIn PDF document text
    • http://demask.fun/how_much_does_navy_seal_training_costne7tw.pdfIn PDF document text
    • http://dirtygirl.fun/59054156253gc3i3.pdfIn PDF document text
    • http://prosucre.pro/tugizixosut71yg.pdfIn PDF document text
    • http://passive-income.ru/monerafubifafo4h68s.pdfIn PDF document text
    • http://cmbclientes.com/diablo_3_witch_doctor_helltooth_pet_buildry9xr.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/vunus.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/6909e4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a338efc8-ca73-44c0-8c66-92341d72849f/67394682309.pdfIn PDF document text
    • http://godemesefiw.epizy.com/bedding_sheet_size_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c550647c-c573-427f-ae05-3a2e203ac5f5/49741074994.pdfIn PDF document text
    • http://luledajosa.epizy.com/wave_properties_and_math_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76dbae5f-2402-4f0c-b0d4-db43b7399f63/98463717167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7846aa-cc9d-4852-8809-fbff34819ead/vietnam_war_guerrilla_warfare_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f5deeb-75cf-46d8-a7a1-6c363890f2c9/mosquito_magnet_patriot_plus_light_codes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 5868 bytes
SHA-256: 75ccbeffb699afe5ef63cf673899ca436fdcabe26f5b49a2cba0052e2b71f99c
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 11616 bytes
SHA-256: 1a8f3371c4eaf0daf5a4753912251b7b8703de1b5c33593c75914d545785f9d1
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d