Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf83d654b6a96d6…

MALICIOUS

PDF

74.2 KB Created: 2021-06-02 10:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ef089f0c995c34fbbf6fc8ee65815e1 SHA-1: c3b46b723405b24ef9859a5c6c9dba97563f79ee SHA-256: 1bf83d654b6a96d6f0d52199a6b1e053c41b9994248024599c1dd4a5e69cf37b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with one prominent URL pointing to 'crewmak.ru', suggesting a redirection or download attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/pbw?utm_term=list+of+animals+that+live+in+the+forest+floor PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476140/normal_60023f09144bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_602aae50056f5.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/54288cd9463b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417023/normal_600985dbc1df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_60298692f1742.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/2182037.pdfIn PDF document text
    • https://zozopagutuduxiz.weebly.com/uploads/1/3/4/6/134669393/9ea155b4.pdfIn PDF document text
    • https://linobajeg.weebly.com/uploads/1/3/4/4/134489040/841c7aa6bcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_6004a10848eea.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/50c061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pukagij.pbworks.com/w/file/fetch/144467478/96887701167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392c1568-6eac-4e8d-9888-5a45e91a4895/mirisaduwinedi.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/ti_adobe_reader_9.0_min_ph.pdfIn PDF document text
    • http://feteselulo.pbworks.com/w/file/fetch/144442440/pirifojelofifozas.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144494505/52830934112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5e7f33-2b79-4ae8-ba94-3a887c7cd52e/onan_rv_generator_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11538f3-3e85-4c72-9be7-744b45f87f0e/5583287834.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144486471/how_to_code_search_magnavox_universal_remote.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144424608/como_desenhar_anatomia_-_figura_humana_-_vol._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2b9ab2-f901-45f4-b15c-f15a302f31ae/58582799623.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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 5008 bytes
SHA-256: c598fdf108a9848af499ef6cf590ec874e77b8b86ac1f35935731197a912d81b
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10896 bytes
SHA-256: 66a6e65835206979f70e2763a59f7ca529406d276ea326546306e82fec075131

Open this report in the interactive analyzer, or submit your own file for analysis.