Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b1a40fe0ce4616…

MALICIOUS

PDF

67.6 KB Created: 2021-02-25 06:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de316e74e8b2ea7c1b6f41d4a81ed61a SHA-1: cc2871422a49cbf0ec97d49db6148979a853d9a1 SHA-256: a5b1a40fe0ce461632e4039a0aad8f0835fd909dd9d64ebea1a725a7871a3001
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing a second-stage payload. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malware.

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://baarspo.ru/strik?utm_term=hobart+meat+slicer+user+manual PDF link annotation
    • http://stixlife.info/how_much_is_a_2020_toyota_camry_xlemqk0v.pdfIn PDF document text
    • http://povar2020.site/33721193822rv5c9.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/1gigd80/flip_phone_at_t_walmart.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/65731968328.pdfIn PDF document text
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/kosurobidesatibuf.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/71861305513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_602b71af2f763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ff4c542d1676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_601ac4cea5c33.pdfIn PDF document text
    • http://ighelpcenter.xyz/katupab2pg7.pdfIn PDF document text
    • https://wujadadi.weebly.com/uploads/1/3/1/0/131070572/pusata-pidamerumegusud-fujikujetiw.pdfIn PDF document text
    • http://sluzhba1.net/ship_tracker_24_pro_apk1rk7l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepofif.onlinewebshop.net/plc_programming_training.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/gomoposomo.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/backup_gmail_emails_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/30121445590.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_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 5044 bytes
SHA-256: 415d9f0122e018d4ad724f7b79f0c05933438360bd42fa7286e16bc72eaef7c8
font_01_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 10052 bytes
SHA-256: 7bd7cd087c6509da0fdedd050a418031d6b4e265edb5d03458acfb2b5a394236

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