Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d7da228985c731…

MALICIOUS

PDF

70.3 KB Created: 2021-02-22 01:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 86e74f18002934f36033fd2c1de41779 SHA-1: 48f0e8912c93c2db5b3a8f716a7e9a9a1edde5e1 SHA-256: b1d7da228985c73176716301d558c9955dfaa921af59dc33f78c2e751155014c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'coloring pages'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these 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/123?utm_term=muscle+car+coloring+pages+pdf In PDF document text
    • https://cdn.sqhk.co/tujuvemevo/ghwHZBA/launcher_hijack_app_cloner.pdfIn PDF document text
    • http://copyright-infringement.business/96804520985a7djz.pdfIn PDF document text
    • http://itravelimpressions.com/hi_tech_syrup_for_saleuffvx.pdfIn PDF document text
    • http://osummer.space/probability_density_function_pdf_and_cumulative_distribution_function_cdfhs5dt.pdfIn PDF document text
    • http://boost-store.net/47192962859v6xmr.pdfIn PDF document text
    • http://adyga.site/79337009371nasb0.pdfIn PDF document text
    • https://cdn.sqhk.co/lefidotoxono/FifyiiQ/zupoguniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_602b5b4885970.pdfIn PDF document text
    • https://cdn.sqhk.co/dojerilu/qUt4hiS/apple_old_phone_ringtones_free.pdfIn PDF document text
    • http://mavitrade.com/3421161633waapt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_600cf7953ddea.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/u1Agcig/monkey_ropes_course_new_hampshire.pdfIn PDF document text
    • http://keksik24.ru/76471602920bw12v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sotexazonilot.rf.gd/23840190498.pdfIn PDF document text
    • http://taguramol.rf.gd/canon_lide_300_brochure.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/dead_space_3_able_content.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_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 5328 bytes
SHA-256: 75794937509332a52948596d99e7beb265695ede97d6c7acdcf8ae2e7fce1792
font_02_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 10928 bytes
SHA-256: 4298b4f6bd7e254de9cbb2a0e58ca5e71df4277d1389c59fbf592ed171159f45

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