Malicious PDF — malware analysis report

Static analysis result for SHA-256 1727a34a9b81a171…

MALICIOUS

PDF

85.1 KB Created: 2021-04-03 01:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 54f2f7feb867fe91e65bf569aefdae3c SHA-1: c7d2f2d05939feb36a7d8dd23eb7ac7a34213748 SHA-256: 1727a34a9b81a1714712504d215aa646cf9e6bc3bd89ab5abe1fc2030938fc55
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily corrupted, contains fragments related to search terms and application names, reinforcing the idea of a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=how+to+change+battery+in+bulova+precisionist PDF link annotation
    • http://nowefatot.22web.org/60872845963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_600a529cf07ae.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/Ln2zhhZ/zejobokuwowijakolojatix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_603cc1bae825c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379973/normal_5fe4d269c0700.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/kalender_2020_indonesia_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413986/normal_5fd04a2cb69d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_605bbffded379.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/UFSNSyi/18569822772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384310/normal_5ff97e6e013f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_603781eaf25d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403676/normal_602aee05d5bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_603a2e19e3e62.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/xajolidijizokuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_6039e01b3ec3d.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/fYF7jiL/dakomudapetowusibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikoliduxa.atwebpages.com/how_to_change_a_lightbulb_in_a_ge_microwave.pdfIn PDF document text
    • http://patenat.epizy.com/bengali_short_comedy_drama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426f786d-91a0-4430-be93-164d469d6e3b/domiwuzozafafelurit.pdfIn PDF document text
    • http://gevorewububew.epizy.com/amiga_forever_essentials_1._04_apk.pdfIn PDF document text
    • http://viwefar.rf.gd/learning_how_to_learn_hubbard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ef5716-c16e-4ed5-bd80-0b361118941c/nanipefepep.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/lease_agreement_addendum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcc3762-e9aa-47a5-bcc9-324dd0698a75/sipavigexejewarawe.pdfIn PDF document text
    • http://jokosen.atwebpages.com/40747471905.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_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 5552 bytes
SHA-256: 50003907e83c356a174e8ea93665594edb5f204f2c33a20959d1da1de096d3dd
font_01_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 11968 bytes
SHA-256: 5dd535996c81973eedd30d203bc56c4509e5694aa5b944622f4b57e7c1df5ce6