Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac34474ee75b604…

MALICIOUS

PDF

68.9 KB Created: 2021-02-23 01:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8fdd06784ec0bd2534056d094f631ea4 SHA-1: e492779a1a7d07e19490dfe9a458fc50646a58f6 SHA-256: 1ac34474ee75b6047ca043ad4c2c63dde8811d8ac7b4833e18a2a3782af74194
244 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, including a critical redirector link to 'https://yafferge.ru/strik?utm_term=juegos+de+hombre+ara%25C3%25B1a+en+moto'. This indicates a phishing or scam attempt designed to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=juegos+de+hombre+ara%25C3%25B1a+en+moto In PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5fcef666182c3.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/OIieUjg/84990112904.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/sobezugekojava_zuxoven_govaz_kifanumuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/d01n5GX/game_creator_free_download_for_pc.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/eec73dbfcd49.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/c7afd91ed.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/ha1jg4G/92575908069.pdfIn PDF document text
    • https://dumosube.weebly.com/uploads/1/3/1/1/131163669/91bf50.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/chcgejh/download_cafeland_world_kitchen_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5feeadf551df5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_60048aecd748a.pdfIn PDF document text
    • https://mipupupomekux.weebly.com/uploads/1/3/2/7/132712043/1a49fd33a655.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/239661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496146/normal_5ff3a7a783c37.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/6607201.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/wusone/creative_resume_maker_online_free_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/english_worksheet_for_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/wunepigatepoma.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_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 5548 bytes
SHA-256: 121cd1bc8715707859eef4749c62d866b1ab8a76755586fad5d212f2d0056e35
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 11368 bytes
SHA-256: 186bb04510773ffe2b344b0d554cacce16668ebecfcc7b766000f70dd09307f4