Malicious PDF — malware analysis report

Static analysis result for SHA-256 966f661b28daebd4…

MALICIOUS

PDF

77.9 KB Created: 2021-03-06 13:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 17e0418a3fc9d482525d4e3bd41d8cb6 SHA-1: 8efa5495d136324a7c65c9b4330dcde1900b91f4 SHA-256: 966f661b28daebd480963436f2445d8ea73c571337d65afe0ab3ca86fd505551
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically linked to a search query for a math app. This suggests a phishing or content-luring scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=what+is+the+math+app+that+solves+problems PDF link annotation
    • http://pokujedamoku.22web.org/nebalijifide.pdfIn PDF document text
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/ea819bf27cc351.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/panuwalafiderevudutodum.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/texas_dmv_affidavit_of_heirship_form.pdfIn PDF document text
    • http://rimowew.22web.org/cengage_publication_chemistry.pdfIn PDF document text
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/9110071.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
    • http://jowimonaperu.epizy.com/how_much_do_mcdonalds_employees_make_2020.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/how_to_identify_a_pre-64_winchester_model_94.pdfIn PDF document text
    • http://balanuvanatitan.epizy.com/87210982658.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/cadaver_anatomy_book.pdfIn PDF document text
    • http://datidogebe.epizy.com/dorunivasewemoxifun.pdfIn PDF document text
    • http://gejulakan.epizy.com/in_some_way_shape_or_form_synonym.pdfIn PDF document text
    • http://puwagof.rf.gd/44387464269.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/how_to_calculate_molar_mass_of_a_compound.pdfIn PDF document text
    • http://kitomov.epizy.com/beehive_class_9_chapter_5.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/operations_management_air_force_asvab_score.pdfIn PDF document text
    • http://fukuselumetu.myartsonline.com/15937403536.pdfIn PDF document text
    • http://konajif.epizy.com/cica-_care_silicone_gel_sheeting.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 4956 bytes
SHA-256: 5e2ab86bafe089957a60e4418e1b7b3ee425b28861b82ade3e838ce6de362af6
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 10776 bytes
SHA-256: 0ae1474f64cdea3cfde7e58d762e593d433fd330b70652db1b59a245e35bd201
font_02_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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