Malicious PDF — malware analysis report

Static analysis result for SHA-256 725f653c3eb53fc6…

MALICIOUS

PDF

89.7 KB Created: 2020-12-24 11:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: abd893359b5cc249206e9d988777abd7 SHA-1: 9830fd9c69aba45253a4c82c168d7aa8fbfe2212 SHA-256: 725f653c3eb53fc636e42ee8afeb470729fddbe0adf0960b8850d0dcd4404e23
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to a link farm on disposable hosting. This structure, combined with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to downloading a game, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/strik?utm_term=flying+bird+flapper+birdie+game+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5fe415781df23.pdfIn PDF document text
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/7389766.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/22dd5.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/ranojajimatejotu.pdfIn PDF document text
    • https://latowinu.weebly.com/uploads/1/3/4/5/134508675/4062769.pdfIn PDF document text
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/6980478.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/jobugetanejuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_5f9ad858d2734.pdfIn PDF document text
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/tofotexofadej.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/0bc3139cd.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/dovulavavo/calligraphy_script.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/dugaxog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b456ad6b-5f47-4ea0-b8e4-4a2ee70ca7e8/kunin.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/map_of_bermuda_bahamas.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/pdf_bestand_versturen_via_whatsapp.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_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 5472 bytes
SHA-256: e4e6db06e4051a68fdbb4ce6b2eb877b9d6b35ece5ac33477e976c03cb5bc332
font_01_sfnt_off00012160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 2372 bytes
SHA-256: 84b286065823f107a9b7155f62658fd5e616f7171ba22fd696601172b28470b4
font_02_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 14040 bytes
SHA-256: 6d8444729ff9ffedb80340a4e3713848b763ef87f1670f816b2334b2c0c94650

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