Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac91e8e088fb525e…

MALICIOUS

PDF

90.0 KB Created: 2021-03-13 18:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f8bea66411beb779de9346fa5a4dbcf2 SHA-1: 9e8b72a15b8fe9cd807f0e63bc010503f2b6a9c5 SHA-256: ac91e8e088fb525e8342aa95347cd72270963da653227ca1fb62bbb893c693ca
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=what+is+the+theme+of+rumble+fish In PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/aeadf8ddef65112.pdfIn PDF document text
    • https://kuvenamowafave.weebly.com/uploads/1/3/1/3/131379608/39132ebc5612.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/xofawi.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/87267402393.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/23934a19f4.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/2548250534.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/kejur_pugezedetoze.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/ethiopian_grade_11_english_textbook.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/jeluj_neliluwe.pdfIn PDF document text
    • https://siforedovuwalo.weebly.com/uploads/1/3/4/7/134772634/c81a42a.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/ac605.pdfIn PDF document text
    • https://sewolisexuvafu.weebly.com/uploads/1/3/2/8/132815731/3a365878debb1.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/055ec32f743.pdfIn PDF document text
    • https://zitidimesefe.weebly.com/uploads/1/3/1/6/131606065/natupuwoxun.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/fukepez/practice_c_programming_online_free.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/lyrics_to_gonna_rise_up_singing_its_a_brand_new_day.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/99447520072.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/rebimasejijozalojotu.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_343c262177ac4543bfb504b683aa7a79.pdf?index=trueIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_e465be7efbfc4ac8a5ff02e131e8e1c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/devesavevonud.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_5cb9342c33df4cc9bad68694decfbf73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/mercedes_a_class_2017_owners_manual.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_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 5160 bytes
SHA-256: 8e57716a4ab56cbfbce1a2c0090bf8e1f25a17b52995bd1dcc993c9303850860
font_01_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 11644 bytes
SHA-256: dc38eb567ed1852ab179525df710363eeceb497c2ef6a833bb74b55c9d69d3dc