Malicious PDF — malware analysis report

Static analysis result for SHA-256 2237f0bfd39fd5af…

MALICIOUS

PDF

75.0 KB Created: 2021-02-15 18:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a96db03d0b94f73c0f4c7d9bacfa6e28 SHA-1: f62024b8248485ec2ea31b3152d034faff54b36c SHA-256: 2237f0bfd39fd5af5c6fc6d9fccfc63d09d0ab8f1a541de2a0ec8182508b2a30
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspected phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple disposable hosting domains and UTM parameters suggests a campaign to distribute malicious PDFs.

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=motorola+two+way+radio+instructions PDF link annotation
    • http://rexidoguvigibux.22web.org/attendance_record_sheet_monthly.pdfIn PDF document text
    • http://turodes.iblogger.org/nosomibiwilobupotuwaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/hehcjiX/asana_rebel_app_price.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/palizezomux.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/Ymhj3gd/american_vintage_bean_bag_toss.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/ae33eea8.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/jevisagafuki.pdfIn PDF document text
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/b9b42a66de794d7.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifenax/haHjbje/football_career_games_pc.pdfIn PDF document text
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/2a3da67c073b1cc.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
    • http://sotegoduwibadaj.epizy.com/9521586953.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/26508776699.pdfIn PDF document text
    • http://pemixatu.epizy.com/39838745140.pdfIn PDF document text
    • http://roragopijejem.epizy.com/something_to_hold_sheets_on_bed.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/gloomhaven_brute_enhancement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/free_geometry_proofs_worksheets_with_answers.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 4896 bytes
SHA-256: 0dd853dc592f2b09ee6c67bc70b516975ae56f9dbea5469229f7f13d39826370
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 13412 bytes
SHA-256: 56fa3b448b0120d08fb3c247bf88c7b4df1e525b575b72020e3a5b97348074a1
font_02_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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