Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7111f735586784c…

MALICIOUS

PDF

69.0 KB Created: 2021-02-24 02:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: abd118a0191a812b30fc5187174e5efb SHA-1: 83fcb9d8bf1941df871cca0dd528cb98a288ec24 SHA-256: d7111f735586784ccee0b4fee888de2dade23ee34d4d486b586edb69b7113d2d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a notable heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs, such as 'https://jottigo.ru/strik?utm_term=sql+server+management+studio+2008+r2+tutorial+pdf', are designed to redirect users to potentially harmful sites.

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://jottigo.ru/strik?utm_term=sql+server+management+studio+2008+r2+tutorial+pdf PDF link annotation
    • http://yachts-4-sale.com/58039995542nacjb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_60357ed089d76.pdfIn PDF document text
    • https://zoxuxidez.weebly.com/uploads/1/3/0/7/130775284/xuboxopefimeri.pdfIn PDF document text
    • http://cetapp.xyz/tavorgp7hl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5febce2f94895.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/0cb94fa976ad6e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_602d3aa753628.pdfIn PDF document text
    • http://usechambre.xyz/sign_in_with_apple_id_swiftsxoz1.pdfIn PDF document text
    • https://tumumasozoborux.weebly.com/uploads/1/3/1/4/131453535/ba803a7eb061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fcf46df4ed2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_6026a6fe6fffb.pdfIn PDF document text
    • http://nibelv.xyz/342068783760jewt.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/zifozujiwi/nimebakikutoporibuve.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/bible_commentary_books.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/cdc_vaccine_information_hep_b.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/yanda_kartavya_aahe_marathi_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/zefafumufuxarideponutu.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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 6120 bytes
SHA-256: c56d334fa528617c24e2bbbedefc5257b89e1813ccadecb0d56871b21f67c4e3
font_01_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10212 bytes
SHA-256: 8fb55e8bacc7ceb40dfeb8a03100dfcab0b2ba5e7e3d70120c57ecb6f30f957f