Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c953a6e13eb78df…

MALICIOUS

PDF

86.5 KB Created: 2021-05-05 23:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a63a87a9b25cd417e79b50992d4d451f SHA-1: 2db0d384428fdd19e12abbb5a2c35253915bdf24 SHA-256: 6c953a6e13eb78dfb5664754c5a1908127e6b5347df4fa6550dc34c3566948e2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=when+the+sky+is+dark+quotes PDF link annotation
    • https://bomitepoz.weebly.com/uploads/1/3/4/8/134895739/ripuvaveta.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/sosupupisawikajodelamoka.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/ledifufeper_sidipol_denon_puvepolajokav.pdfIn PDF document text
    • http://rojeropopugu.iblogger.org/chingiz_aitmatov_the_first_teacher.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/solex_carburetor_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/jhbigzs/xamotuvita.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/5059599.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/b0b07e87acba.pdfIn PDF document text
    • https://cdn.sqhk.co/mafulavet/S5gejcm/dafopulugebok.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/iiha0SJ/rezenaxolidekepet.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/wotodedaruzuk/sefojekatabebigonisujuzu.pdfIn PDF document text
    • http://loxojazevujiv.epizy.com/math_dictionary_download.pdfIn PDF document text
    • http://zuboxevu.epizy.com/zidepuxufajegeteziv.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/how_to_write_a_presentation_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/what_are_the_23_drill_commands_for_jrotc.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/tikawovotiwixe.pdfIn PDF document text
    • http://devedejabamox.epizy.com/antecedentes_de_diabetes_mellitus.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/79429120595.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/abbyy_finereader_12_full_crack_sinhvienit.pdfIn PDF document text
    • http://kimogule.epizy.com/xefujage.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_22aa118434544dc2926d4f046d7a68dc.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_5998b91cf77e42cd98174eabd52fed69.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_a576f04e8ffc4115a9176e92f3bf3722.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_077ba360061644dd9c030e45644b9df1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 5188 bytes
SHA-256: 9ccf56e32f09c76bdf8001f32a7304c2f9b93e74a8d8e02ed750dfdb491a14e4
font_01_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 10712 bytes
SHA-256: f74796b617d24fb562c3a7d5d41e04d4326de9cd738249e4f084d2975b17a261