Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77cea3c43a8f439…

MALICIOUS

PDF

71.8 KB Created: 2021-01-13 03:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ac0f15b6ba9c00c742d11c17387d3e84 SHA-1: 17db490553bb495e2c62e2f586ddfe17370cb917 SHA-256: e77cea3c43a8f4394d3febf8b4709dcc9a0abfadb88975cc36dc043da5cb529d
184 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure the user to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=proper+military+funeral+etiquette In PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fc89ac26b005.pdfIn PDF document text
    • https://site-1194102.mozfiles.com/files/1194102/perfect_ice_cream_temperature.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427811/normal_5fcf35c253362.pdfIn PDF document text
    • https://site-1246207.mozfiles.com/files/1246207/mobileiron_appconnect_sdk.pdfIn PDF document text
    • https://site-1168054.mozfiles.com/files/1168054/51191102930.pdfIn PDF document text
    • https://site-1221793.mozfiles.com/files/1221793/19701604756.pdfIn PDF document text
    • https://site-1168209.mozfiles.com/files/1168209/70239804040.pdfIn PDF document text
    • https://site-1175681.mozfiles.com/files/1175681/71790318750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452171/normal_5ffe43169607b.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/ihjicNY/dream_machine_game_ending.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/chowdhury_and_hossain_english_grammar_book.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/xhfhfvP/papusabepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaloto/61786532941.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/patezibelutez.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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5100 bytes
SHA-256: ed8c41cf8dca142d8e4331adef8a9adcb29b8b6d27185c86685c11d9d7d233e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10252 bytes
SHA-256: 5cfeecc814c5b878b8296dde89332cbfce7536a2ab313cac280aa1210bc88e19

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