Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac257ee8c1c6207c…

MALICIOUS

PDF

76.2 KB Created: 2021-02-20 04:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 01a04b5fab760cc09e4fdbcae844622b SHA-1: c974ab18273e4d99689f345b86a131a200690462 SHA-256: ac257ee8c1c6207c7c4918b7b22d70cb1564d1463d47740c711bc94b8a01d751
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. It contains numerous embedded URLs pointing to external PDFs hosted on disposable domains, suggesting a phishing or SEO spam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://yafferge.ru/strik?utm_term=most+famous+power+ballads In PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/ddd0cb0.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/ggjaifN/56949768907.pdfIn PDF document text
    • http://topstudy.fun/alan_watts_this_is_it_quotes7t27b.pdfIn PDF document text
    • https://cdn.sqhk.co/daviwiloma/htyyuHT/ski_jump_exercise_muscles.pdfIn PDF document text
    • http://plusstore.pro/nobaduk7pc3j.pdfIn PDF document text
    • http://triple-doska1.club/pocket_mortys_morty_games_guidekw3pw.pdfIn PDF document text
    • https://rozigakix.weebly.com/uploads/1/3/2/3/132303329/sefita.pdfIn PDF document text
    • http://cpatrump.com/ielts_book_6_test_3_answersgyfa6.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/yReggNq/susiwebagis.pdfIn PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/vusetavinimi.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/cFGgche/12570213512.pdfIn PDF document text
    • http://pejalajumore.22web.org/mekoxive.pdfIn PDF document text
    • http://pr-bux.online/6074325588323749.pdfIn PDF document text
    • http://euromarket.pro/building_planning_and_drawing_by_kumaraswamyih7nj.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/gdSig75/81587900107.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/cBhVjb5/redstone_builder_for_minecraft_pe_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/gi2khgM/75564860971.pdfIn PDF document text
    • https://cdn.sqhk.co/pememobuwir/XfWZthe/93870228164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopogapusokudip.rf.gd/29589039536.pdfIn PDF document text
    • http://nujexaraxeb.epizy.com/lemoraduxirog.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_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 5424 bytes
SHA-256: 66a798d2b1b26df5715bc3041a114a5062fcb332bc45385698a072f3b8b72312
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 11064 bytes
SHA-256: dc5a46ff135db7cc311ebca48fac1eeced2b903905f482f49be273efe8beb0fa

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