Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe6f450e962301f…

MALICIOUS

PDF

82.4 KB Created: 2021-04-02 10:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5c8626099722a2b80b3e9eaef1092caf SHA-1: bafbb7f0cfbfaeef720a75dd68558a488fe92c5f SHA-256: dfe6f450e962301fc2a7865fcff4c4cd2d0d23cccfcc7ccde5f61705ed5c2feb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/123?utm_term=ariens+st824+snowblower+repair+manual PDF link annotation
    • https://cdn.sqhk.co/dajuzafum/hbhfhgS/capstone_logistics_llc_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/rinovizifim/jmYoNst/80807306864.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/jaje3ev/13542804633.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/hcthdBQ/sifuvezisiropevonovaj.pdfIn PDF document text
    • http://giocodigital.space/pegelaxad2nned.pdfIn PDF document text
    • http://optamorem.com/ejercicios_de_movimiento_parabolico_resueltos_yahoorkrmo.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/hbNUTOz/square_pyramid_faces_and_vertices.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/hfujeCJ/32653409076.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/KTwyhgi/lewawog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_70b56f446e5441cb8ff9f31e1de4fb65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c87f5a-31e2-4b02-9820-3550878ea7ca/civics_today_textbook_chapter_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adee372c-26a7-4f66-8ce2-2e13da3df63a/how_to_change_oral_b_vitality_brush_head.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_b5f305be64364abcb61a24a1f28fa08d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9355d761-0dfa-44ba-8416-aedf0f61fdb1/what_type_of_bread_can_you_eat_on_a_low_fodmap_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/rewiwatuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c174c36a-9b30-42e0-86e9-9daaf03ea197/how_to_connect_canon_mx922_to_wireless_network.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_dd8ea37e177a40bdbf34cfa9ec30d467.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_c51383b6605b406bbb2371aaf2fb3f85.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_c8e8ef1e4a17472c895582b56e113b41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/which_university_is_best_for_data_science.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_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 5600 bytes
SHA-256: 25f09b52267836ad45d057190694aa16e13e953b53e0689794c505f5d9646822
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 10504 bytes
SHA-256: 3d0743b72dfc8df4adcba3a31b1938108e0b677aeeef95e413520b669372d003