Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d29e5816330c24…

MALICIOUS

PDF

91.9 KB Created: 2021-05-13 11:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5318b9ffac3b3b2b21fd856a8e24a083 SHA-1: bb5bb7c6fe15e0add7a2f2b57cab705f05fe39c7 SHA-256: 55d29e5816330c24a8b495bca8d43bad20ec5522a4187c5631f32df6f9f372bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=what+does+employment+background+check+include PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fd5f3ade8dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_6046f1f933209.pdfIn PDF document text
    • http://vinograd.io/why_is_my_car_sub_not_workingalaaq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_60585bc64e1ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_600fb48124e3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379987/normal_5fe2dcd52707e.pdfIn PDF document text
    • http://sexutumuze.22web.org/70058696275.pdfIn PDF document text
    • http://bufukaw.iblogger.org/common_core_standards_social_studies_2nd_grade.pdfIn PDF document text
    • http://gdztut.com/the_four_hour_chef_tim_ferrisszdifz.pdfIn PDF document text
    • http://dudisigufazalu.22web.org/puzefotemagujazitadad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375522/normal_60008503b5973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_603871e9cc512.pdfIn PDF document text
    • http://tur8osale.site/17023621576igdgy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_604882f305d53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadokeg.epizy.com/nepijolusojawapin.pdfIn PDF document text
    • http://mubadel.epizy.com/chemistry_lab_manual_class_11_cbse.pdfIn PDF document text
    • http://bufoxujofepir.rf.gd/analysis_of_variance_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/sarojabazatugasu.pdfIn PDF document text
    • http://votoromuw.epizy.com/lonuwazixisimuw.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/32990824252.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/domuviwalofurupukuli.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/kigavoxepolarudesir.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/gederaruxojonavikivaxitus.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 5804 bytes
SHA-256: 4be8d0090f9423b49e9c639890d0ec0dd4d223c462e02ee8232589626c85f79f
font_01_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 12136 bytes
SHA-256: 1c8ed9e9de19860cc31fee776e4927d293c6b2a35adf6eb2689205e3bfb34230

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