Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdfef7c3e525bd8…

MALICIOUS

PDF

80.0 KB Created: 2021-02-06 21:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60b1f485833cd4b609ddc3dba6520de7 SHA-1: cfe0a6d2b5f198052cc15b33f1c1be0adea1abcb SHA-256: ccdfef7c3e525bd8715c97a9926120d73d1c26d2950e6d7b699778ffaea3be1c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a product manual, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/wb?keyword=bosch%20microwave%20hmt75m651b%20manual In PDF document text
    • http://ourfanz.com/h_s_c_marksheet_2019rtagw.pdfIn PDF document text
    • https://gukejokofa.weebly.com/uploads/1/3/0/7/130739315/f70d19614bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_600feda1dc6ae.pdfIn PDF document text
    • http://ecoservice-vlad.ru/mk11_krypt_heads31xrv.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/2130033.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/latadiweje.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/kevawebudalul_didopulog_papozu.pdfIn PDF document text
    • http://salonlabs.xyz/wordly_wise_3000_book_11_fourth_edition_answer_key0iwe4.pdfIn PDF document text
    • http://uchebnoe.website/buwoduvbeb.pdfIn PDF document text
    • http://antonio-ita.space/limiting_reactant_and_percent_yieldv8eac.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/hdsiigg/promo_codes_spirit_halloween_coupon_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regenazuwirege.epizy.com/telezujepamobajanu.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/71639152492.pdfIn PDF document text
    • http://getorisatenazu.rf.gd/python_3._5_3_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/madajejoseduxufoxidi.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_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 5792 bytes
SHA-256: 5e7c573ff24dfeaf0e47f087a782cff236a637d72151ea8c38e5d549c9a99f97
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10732 bytes
SHA-256: cfe16fcb6986d53f5ca48a1bb86c8a3d60f6c13c2c55175bbfbb54834efc0a64

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