Malicious PDF — malware analysis report

Static analysis result for SHA-256 770db905bacbec3b…

MALICIOUS

PDF

156.8 KB Created: 2021-05-08 18:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 04a6f5fe393ad8ff67cf1cee9134e55b SHA-1: 0df119c0dbf2caeb417e1c6b3993b184caf71dbc SHA-256: 770db905bacbec3bd1ec6b39d1535398cab345b8a59a68e7bdea65d5c1a53c01
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=address+a+nobleman%2527s+concerns PDF link annotation
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/d42e62a9a52eb0.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/1530533.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/iejaEjw/nusabazum.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/lefibukuded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_602c4db8488b8.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/ja7gcKI/nipijidakapotogoteva.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/5082Ohc/small_business_accounting_software_comparison.pdfIn PDF document text
    • https://cdn.sqhk.co/nevowokazem/jjJNVjc/las_vegas_national_parks_itinerary.pdfIn PDF document text
    • https://dajurejew.weebly.com/uploads/1/3/4/7/134753869/fumiv.pdfIn PDF document text
    • http://jerijoba.iblogger.org/biological_systematics_and_taxonomy.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/IO96bgh/efootball_pes_2021_season_update_standard_edition_download.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/nopebisobal.pdfIn PDF document text
    • http://karoxekixixaz.22web.org/33147209029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_60667714eec49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_6009daf1f066c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/6520e853-72eb-441e-933e-53f1c254db45/633027420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46012d37-eba7-494c-94c7-76acc49890de/t300_key_programmer_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05483035-44df-4029-bd9e-95984fda0f18/81904249253.pdfIn PDF document text
    • http://jebufatibakuv.epizy.com/ccna_full_course_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16cad459-9711-4b49-9516-5708379914c0/zekinugibeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2edf47f9-1b62-4555-82cd-2a9cfecbde04/schwinn_ic3_indoor_cycling_bike_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54922f63-2d57-44a7-91da-327475f6d400/badger_5_insinkerator_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d931abd-fc82-4f8d-a924-423d2084c354/95407774929.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5FE 5248 bytes
SHA-256: f9e0fcf7deb94ee2a62f7a01e26d72aeead5a4621f1cade6328e23a040708483
font_01_sfnt_off0001f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7BB 10152 bytes
SHA-256: 1f9276b2ce8926843e11fd0e2ca80a180165ea8ee8272cca3849bd2b7ae68479
font_02_sfnt_off000213c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213C6 16896 bytes
SHA-256: 66c1ecde6a5056f925cbefa80103395dfd8a06d979be8ce35e7b3de1e478403f
font_03_sfnt_off000246f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246F2 18168 bytes
SHA-256: f192a8ae9a9020ed912769cab4fa42ab168abfdef809f06d5665c9a7cbdbe97d

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