Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7228407fd75e2d…

MALICIOUS

PDF

89.4 KB Created: 2021-05-03 00:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 20075a4423801ef6e684d5f054b72312 SHA-1: 0776b01d001b98de7b704db0a802159741ffb674 SHA-256: cb7228407fd75e2d3c00bf2835cf52c8eaf9621a6ca864bfaf30f60a475bf34a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xezojetit.ru/strik?utm_term=depth+of+knowledge+chart PDF link annotation
    • http://labincom-med.ru/predator_8750_generator_replacement_parts1jojh.pdfIn PDF document text
    • https://xofiwilo.weebly.com/uploads/1/3/1/4/131453946/5081199.pdfIn PDF document text
    • http://sallehq.xyz/12290367650wmw5a.pdfIn PDF document text
    • http://vuvepexuja.22web.org/best_annotation_app_ipad.pdfIn PDF document text
    • https://sanupeden.weebly.com/uploads/1/3/5/9/135961416/tubapateruledut.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowaguka/ZYiaTrZ/57141238219.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/pgcghju/visodomukifami.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/23862fa5-9663-4b99-8d73-49c570efb7b5/femoxanudofavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf959e1-289c-45a8-a1af-6b562655601a/casio_g_shock_watches.pdfIn PDF document text
    • http://fevidubigozexa.rf.gd/gileripanusixowini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1316411b-2d83-4f23-abdd-26c4f2e15eee/63066588626.pdfIn PDF document text
    • http://vazalavowudepip.epizy.com/33362114818.pdfIn PDF document text
    • http://xetonewob.rf.gd/vinixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d3f55f-8824-41eb-bef9-32a4b5b19dec/grammar_practice_for_high_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26aa6c2-380a-446e-a180-bbb935574d72/d-link_powerline_av_500_adapter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0599ce8-b292-4722-abe5-17c594cd3156/99114359179.pdfIn PDF document text
    • http://kinefemagadepir.rf.gd/algorithms_fourth_edition_deluxe_book_and_24-part_lecture_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6a601c-ad4d-4a0a-8095-fac7e4169fea/37434171755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af057549-84e7-418a-86af-b145d08ffda2/kindle_fire_hd_10_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7ca93a-e1f4-47e8-a9c3-f8adad8df549/4572427846.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_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 5392 bytes
SHA-256: 7aafac33e61c62dd9fd2a1e6ad910cf8a77b0d67b1c34896ec2984a9d28b56f2
font_01_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 11060 bytes
SHA-256: 8f87bf7f4aa4f90a5709979ebc63d042a83f55105d35ef1d56dc487c4d6a0c91
font_02_sfnt_off0001418f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501