Malicious PDF — malware analysis report

Static analysis result for SHA-256 461b47f7d71b3118…

MALICIOUS

PDF

80.5 KB Created: 2021-04-21 22:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ead3ddae832f268b571d0101d233e220 SHA-1: 2cfe293a4763b3577cbaf4db30890b0753de6401 SHA-256: 461b47f7d71b3118be0de5fa7b14707aa83e9fc483515f0a54499397cb9c9317
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'maypoin.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, likely to obscure malicious intent and distribute payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=kung+fury+2015 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453532/normal_60517ff653baa.pdfIn PDF document text
    • http://storeplus.pro/mifesugal00nbr.pdfIn PDF document text
    • https://cdn.sqhk.co/kojuzipag/cEWuibH/fomasesefekepido.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/1Gohedp/business_management_degree_pay_scale.pdfIn PDF document text
    • http://takipleskazan.org/26529498272r07bp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_60332d7b0809a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_605c23aabed32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_6019bf3c2d37d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_606a17e09e099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xopugup/the_adventures_of_augie_march_first_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbbe5e5-e3db-4be6-9431-c637a8b282d4/what_is_20w50_oil_good_for.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_d89ed0b9c9784f91a29e895180f6a390.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/avamys_nasal_spray_patient_information_leaflet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8e03fc-97e7-4604-ae1f-11259a77fa03/rosario_de_lagrimas_de_maria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368c3697-96e9-4442-a583-ff5ab44d6693/a_arte_de_amar_erich_fromm_frases.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/numudesow.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/52438952028.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_7de25f5da9f74ffd9b333e18bcd8b2d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/hunger_games_ita.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_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 5036 bytes
SHA-256: fad74fc446340d34a9d71bbc54ddcf76882acfc91d6b3e180d438cce5f0097dc
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 11892 bytes
SHA-256: 57d06b789b322501cc18f61967699a4f8d172097bd81708a641ac892d6d94144

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