Malicious PDF — malware analysis report

Static analysis result for SHA-256 997258f4dc6e13ef…

MALICIOUS

PDF

81.0 KB Created: 2021-03-10 20:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8af087fddac2f3b44d905857472730e8 SHA-1: 24fba75dbe674a23b643e6d94fca761a34f8b958 SHA-256: 997258f4dc6e13ef87695d5b55aec9d0aee8f8473cf92e5b2da6ce4a6304b2ea
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 hosted on 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 point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=a+kind+affair+2017+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5ff0f64a96652.pdfIn PDF document text
    • https://nusikunamapuger.weebly.com/uploads/1/3/0/8/130874430/bubopenojaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fed1cd49fa0a.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/1102053.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/wuwesogox.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/28dac7.pdfIn PDF document text
    • http://walapapu.iblogger.org/building_construction_hd_wallpaper_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_5fd286b51dad3.pdfIn PDF document text
    • https://dolumipekino.weebly.com/uploads/1/3/4/6/134625527/nepavurufejisomuzad.pdfIn PDF document text
    • http://giwepaz.iblogger.org/9307505648.pdfIn PDF document text
    • http://buledumemo.iblogger.org/94435521794.pdfIn PDF document text
    • https://woxoxuwavi.weebly.com/uploads/1/3/4/6/134689382/remezefezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupetomumipur.rf.gd/gefese.pdfIn PDF document text
    • http://wapuzega.rf.gd/93783800477.pdfIn PDF document text
    • http://zofuratav.rf.gd/73411544088.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/52377162896.pdfIn PDF document text
    • http://nenoruzu.rf.gd/luxenokirijabawifumazoj.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/job_advertisement_in_newspaper.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/chablis_vintage_report_2016.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_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 5360 bytes
SHA-256: 17cdaf2a1f3d81aac6e9878c5f80f44a3dbbb3fef25073e7cfe322898b734024
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 11228 bytes
SHA-256: b6755241dd35c252895916440f15b3963932167d7f0180ea38b1deb63454378d

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