Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefd9084ad8fe6be…

MALICIOUS

PDF

79.7 KB Created: 2021-01-20 12:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0c0fb18a7d0a2a8bdc94d0488d517a63 SHA-1: 798ff08e67af4b8889eddf78e8630c8fa4b136d1 SHA-256: cefd9084ad8fe6beaad18d708d68fffd8c6f7bd640905ded0b32f2f461309f8c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, particularly one pointing to 'jottigo.ru', suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://jottigo.ru/123?utm_term=army+rappel+master+packing+list PDF link annotation
    • https://site-1177462.mozfiles.com/files/1177462/tiny_tower_dream_job_or_high_skill.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/ananya_birla_circles_ringtone.pdfIn PDF document text
    • https://site-1221974.mozfiles.com/files/1221974/flat_agreement_format.pdfIn PDF document text
    • https://site-1218501.mozfiles.com/files/1218501/biped_quadruped_ostrich_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/jchbtig/90321956825.pdfIn PDF document text
    • https://site-1239625.mozfiles.com/files/1239625/falling_action_meaning_in_urdu.pdfIn PDF document text
    • https://site-1206032.mozfiles.com/files/1206032/pigutekelekolusuxumujin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5fc9f6a05c25b.pdfIn PDF document text
    • https://site-1167927.mozfiles.com/files/1167927/movie_box_app_not_working.pdfIn PDF document text
    • https://site-1172347.mozfiles.com/files/1172347/zidanowuvite.pdfIn PDF document text
    • https://site-1183491.mozfiles.com/files/1183491/kekujuzofuvewudi.pdfIn PDF document text
    • https://site-1178336.mozfiles.com/files/1178336/twisted_humor_crossword_answer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdda409d9058.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/FsXhfhc/50422809633.pdfIn PDF document text
    • https://site-1171500.mozfiles.com/files/1171500/background_music_recorder_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455176/normal_60078c88eadb9.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
    • https://s3.amazonaws.com/doxifuba/towixiwunuwabavulib.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/ncert_class_12_accountancy_part_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/conclusion_of_internship_report_of_hotel.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/pleyel_violin_duets_free_sheet_music.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_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 5084 bytes
SHA-256: e614b5f0f842d2d1dd5a1fb4de972d1962a5cce4659aec4e56700078dc9c5366
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 11324 bytes
SHA-256: 3bcad08924216b746a60bb6e37c82fea328dcd2700c5e8bbb72a7948f176d621
font_02_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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