Malicious PDF — malware analysis report

Static analysis result for SHA-256 1270aaec4a73b8d2…

MALICIOUS

PDF

95.6 KB Created: 2021-04-09 08:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 79cb3c347bbbfbfaed9a29699b869b78 SHA-1: 2169bf4dd9d4b6ee6b82102ca7b634d1b325b70f SHA-256: 1270aaec4a73b8d214adfa9aea63c3168605af925427e11816ea6b989bb0d13a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/strik?utm_term=what+is+the+conduction+velocity+of+motor+nerves PDF link annotation
    • http://ita-women.space/potters_house_bistro_menupp6g1.pdfIn PDF document text
    • https://fabimevedojepa.weebly.com/uploads/1/3/4/6/134678150/dupelopisetisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5fcb417b459bb.pdfIn PDF document text
    • http://maporivibadiwaj.iblogger.org/84_hatha_yoga_asanas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_60397ed4a818f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5fc90dabb2ae1.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/nusoximixigixaxadoji.pdfIn PDF document text
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/xolesukakuvesiboved.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_602e59b071061.pdfIn PDF document text
    • http://jobauthor.online/lawaraklo48x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6018dec897d9c.pdfIn PDF document text
    • http://all-host.site/essential_clinical_anatomy_by_mooredrosz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_d9c1f9ae01d74601b750152fc01b0e5e.pdf?index=trueIn PDF document text
    • http://ruxabuzavejar.epizy.com/zidilikaxu.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/xigukedememikesol.pdfIn PDF document text
    • http://fazafowunop.epizy.com/4th_grade_spelling_words_worksheets.pdfIn PDF document text
    • http://rejusozutugagur.epizy.com/business_international_salary.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_46f53565e3da45a0acdb9a3c442a4286.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 5436 bytes
SHA-256: 34163f55e5d5daa91ed00d2b13d0a989a87188b923b9d2aeaae5c48818f3ce0e
font_01_sfnt_off000149e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 11488 bytes
SHA-256: 9f40b391a08872adebc6332737d31d79f67f9fd8f485350369e735135f5958e7