Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee916a8d24d59c7…

MALICIOUS

PDF

77.9 KB Created: 2021-06-04 09:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 37820aa2cf4ced2bb042871b17d36c3a SHA-1: 287679cf2d5fe6d9009515b231e36b12de62e753 SHA-256: 9ee916a8d24d59c711576acd1e7ac51962128e4d334200a3cac1613513e17aac
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. Heuristics indicate it functions as a link farm, directing users to external URLs such as 'https://medvor.ru/pbw?utm_term=el+atlas+de+las+nubes+novela+pdf' and 'https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/xaforerowiras.pdf'. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link-luring hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/pbw?utm_term=el+atlas+de+las+nubes+novela+pdf PDF link annotation
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/xaforerowiras.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_600a243a20a87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371023/normal_5ff35b1c8b358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_60216f952125e.pdfIn PDF document text
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/4be38cddbf955a.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/judaninometatami.pdfIn PDF document text
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/c45a3abc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6d678386-7558-4860-80b4-f2bbdf87ab37/9048792335.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/8.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144493014/46211199461.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/lorne_armstrong_tcap_chatlog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85cc696-99f4-4fc4-b259-59a7058a8e9c/11072659094.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/f/kirupoxilediwum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00700f32-7502-4053-a15c-e79f4a87fc7a/how_fast_will_spacex_internet_be.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144412230/lepivoxisenunatafezosa.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144522552/67379300624.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144517089/68588867314.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 4932 bytes
SHA-256: 046266e3e1ac6448df6fd7987530e8cd86d0084c6dbefb38ca6cf585374d2101
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 11268 bytes
SHA-256: f495113a4b87beabed4bfa6d68d55e41b4e26710d6590eed2b8fc08c7cbe9d0c
font_02_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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