Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb4ce7681df1a5b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 06:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 138f18be3c012eb68428b9118186d98a SHA-1: 8c929f8e58c579c4ac1e1091f7d91b5381c7020a SHA-256: deb4ce7681df1a5b33dcab9731bdf2750283b96f4c6b3ceda426d14b0dfb4a56
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to a suspicious domain ('ponafet.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=which+is+the+best+app+to+learn+arabic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420039/normal_5fc6285519db6.pdfIn PDF document text
    • https://jetukuzimol.weebly.com/uploads/1/3/2/6/132695660/11333.pdfIn PDF document text
    • http://stikc.xyz/letter_of_completion_for_ojt_students_templatexyvem.pdfIn PDF document text
    • http://prosucre.pro/dbt_bpd_treatment5rh7x.pdfIn PDF document text
    • http://tufezoba.22web.org/arundhati_bengali_movie_utorrent.pdfIn PDF document text
    • http://connexion-amelii.xyz/how_to_get_certified_in_coding_languages7v7iw.pdfIn PDF document text
    • https://luvagifewu.weebly.com/uploads/1/3/4/7/134766249/lepirabi.pdfIn PDF document text
    • https://fozipapuratub.weebly.com/uploads/1/3/6/0/136088586/9545204.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/bedingte_wahrscheinlichkeit_aufgaben_mit_lsungen.pdfIn PDF document text
    • http://opt15.ru/ti_calculator_emulator_ti_84_graphingi2c94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fe15e2cabdba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380701/normal_6004f12e705d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_6012c8dfbddd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fce124c1200c.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/5e5751ac-1967-4a09-a4c5-7b827dff9c57/monkey_business_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/why_has_my_dyson_head_stopped_spinning.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/assamese_dictionary_for_pc.pdfIn PDF document text
    • http://fefasowuri.rf.gd/aa_12_steps_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/mechanical_keyboard_switch_types_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44095426-927d-41b7-b571-1752f139587b/sound_blaster_evo_zx_software.pdfIn PDF document text
    • http://wekidezeze.epizy.com/67198706391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76f7883-d806-47cd-9090-d0bebd17120c/56395269704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba8cc52-8569-484c-8f83-e9e03672aba6/quality_management_healthcare_definition.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_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 5176 bytes
SHA-256: 4ad6729e2ef28acce0a4d0afa38b900971b2cd2fe522948adb021971ccccb65e
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 10620 bytes
SHA-256: bdf3c7104db6f595023e92c02bbba30d5a1f27bdceea6ebf948c56e0d09fa711