Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1375b2dcc29a5b…

MALICIOUS

PDF

81.3 KB Created: 2021-06-09 08:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 16f38c8adca84f2584dc156461fd8de8 SHA-1: 77b765fea2b409b4545056962ebb83a975e69d0e SHA-256: fd1375b2dcc29a5b81cbe9a8a496aa634b9e88d7fb5341fb9a78ff443e8375ad
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign designed to redirect users to malicious sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nomylo.ru/pbw?utm_term=pixel+combat+guns+and+blocks PDF link annotation
    • https://gibuximo.weebly.com/uploads/1/3/4/6/134665594/lanuku.pdfIn PDF document text
    • https://panodetis.weebly.com/uploads/1/3/4/6/134669877/porexelet_visosajomo_takegafelulif_mokepukiwekanos.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/soxozuwa.pdfIn PDF document text
    • https://vizamonuviwelub.weebly.com/uploads/1/3/4/5/134586337/nuxeguselosuge.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/50ac70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_5ffcf3a0c76ec.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/8450385.pdfIn PDF document text
    • https://gobalubige.weebly.com/uploads/1/3/5/3/135339343/zositurerijasekus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_601f0d258f331.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/4ca84c.pdfIn PDF document text
    • https://bejuzozomixur.weebly.com/uploads/1/3/5/9/135966319/746999.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/c01e572fe65cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_60126062b5ea0.pdfIn PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/dupobozedirunuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_5fd8190c00e06.pdfIn PDF document text
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/tiwenaxonofilo_pidakuwokukakag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebetedoke.pbworks.com/w/file/fetch/144869631/63274830844.pdfIn PDF document text
    • http://kiruguwota.pbworks.com/f/11154789025.pdfIn PDF document text
    • http://laxujaju.pbworks.com/f/ba_first_year_notes.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/abhimaan_2016_bengali_movie_full_hd_720p_hdrip_free_download.pdfIn PDF document text
    • http://kevesefazoga.pbworks.com/f/57387956353.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/readers_theater_scripts_grade_6.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144444231/apeman_h65_trail_camera_manual.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144891705/68343038518.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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 5436 bytes
SHA-256: 0354f9d2ccee7c7405a3e4698109056498962ddf8369559d3401c197502c7d37
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16960 bytes
SHA-256: 7db9566af0650f9c8e650eac1c6db61c2e9ccd0ac5696b555aa6ec261417fd2b