Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86317e9680634c1…

MALICIOUS

PDF

70.6 KB Created: 2021-01-15 04:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4ca139ff959dc81c37dc1d6d54128d2d SHA-1: ed1e55bea5a07985ff4ea1930c185b158f81cd4c SHA-256: c86317e9680634c1413e8f9b48635ea8b81fa76b31369ab5312e7f2bd1f4392f
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, forming a link farm, with at least one URL pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/123?utm_term=prayer+to+juan+diego In PDF document text
    • https://site-1168233.mozfiles.com/files/1168233/easy_mini_bowling_3d_model.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/iggsXlE/govaxeragekuvokimofi.pdfIn PDF document text
    • https://site-1168308.mozfiles.com/files/1168308/prompt_answer_mode_2.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/jgjiwie/merge_block_2048_puzzle.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/Xi92E8O/blue_tie_dye_hoodie_and_sweatpants_set.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/tjhidAB/1st_grade_worksheets_free_download.pdfIn PDF document text
    • https://site-1173634.mozfiles.com/files/1173634/varurizogudegiwanenofukes.pdfIn PDF document text
    • https://site-1168410.mozfiles.com/files/1168410/12180135050.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/Ridjajj/tusototuzamu.pdfIn PDF document text
    • https://site-1083792.mozfiles.com/files/1083792/20262977846.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/640e9fee3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5fa4840806a16.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/inotia_4_mod_apk_no_high_damage.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/5346685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 4964 bytes
SHA-256: 37e109629251182f4304afa22bc599e18bc777d73aa78cf93bf9d59757f7e5a9
font_01_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 10608 bytes
SHA-256: 2fbbcdd5abe9064f95d533450424c2ab4eaf88e5c604ec524e4d3f20ba889eb1

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