Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaaaf24a4cb3ae4…

MALICIOUS

PDF

71.2 KB Created: 2021-02-23 18:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7629d9bce8a21b4e8eb5bfeca51683d8 SHA-1: 598cb5f57d5c654a8a7d1e6c6fc1a3cce350b897 SHA-256: ecaaaf24a4cb3ae46e42ea6b7ae72f114b3a6d6292f3d3f6e830d8c3aa29fe6d
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=en+el+jardin+de+la+fe+en+espa%25C3%25B1ol+pdf+descargar+gratis In PDF document text
    • https://gusijanuvo.weebly.com/uploads/1/3/0/8/130874241/85f38455.pdfIn PDF document text
    • http://triple-doska4.club/fagimulibifefebobibadw8te.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/lonak.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/radapaxat_momugiduloxowo_lefexerewil_vovometilim.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/xatolaromoxib-pufazolasuv-paraworenano-kazedurixolapoz.pdfIn PDF document text
    • https://kepubaxolawava.weebly.com/uploads/1/3/4/7/134703856/bafufojawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_600bf680b14cd.pdfIn PDF document text
    • https://xijadusulotogu.weebly.com/uploads/1/3/6/0/136089771/8af9d402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_601ba5636de8d.pdfIn PDF document text
    • http://starkrobotics.org/dan_brown_books_the_da_vinci_codey6ar9.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/9d8b1a9c7dac2.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/vunumebivisise_jotugomamof_rinowifekoz_foladiwibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_5fd03baa66de9.pdfIn PDF document text
    • http://coloradocustomelectric.com/daxazuwujokusiziigmmr.pdfIn PDF document text
    • http://galoomer.online/integrated_math_2_student_journal44jfz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_60271ec575e1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajewilogofiro.epizy.com/acca_f8_bpp_revision_kit.pdfIn PDF document text
    • http://kodadus.epizy.com/2016_camaro_2ss_performance_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/buncombe_county_arrests_daily_reports.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/zoxuzofivoxomilalawew.pdfIn PDF document text
    • http://latowetutut.epizy.com/msds_sheet_for_clorox_germicidal_bleach.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/academic_ielts_essay_topics_with_answers.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 5568 bytes
SHA-256: b009adcca8fb30331570f6649c5c8e1cbb6613647b95a1442d5cf8282fcc74a0
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 11576 bytes
SHA-256: 9ffcaf98831f7d6b1c13959e3d96ddac963c59577b597797279d0501e6b4a2a9