Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecab1fe5aff001a…

MALICIOUS

PDF

78.6 KB Created: 2021-05-10 22:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a0ec40502ee34dc7d38d03ef97ba98f3 SHA-1: 044675b095b66e45a8d92d73b7f8c13eb3b620c2 SHA-256: 8ecab1fe5aff001ac8ebfe7e8da60e4e7e80fc78c5f3477ed830c8e8afcd7448
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. An external URI, https://jottigo.ru/strik?utm_term=words+to+describe+fluffy+clouds, is present, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=words+to+describe+fluffy+clouds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408703/normal_60055b1a37fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_605c29e40ab0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_604a302818328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5fcd99ef8c13f.pdfIn PDF document text
    • http://noziwop.22web.org/walatosaxesuzorexeniwopi.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/ahgjgjb/texas_holdem_poker_deluxe_free_chips.pdfIn PDF document text
    • https://dupuzebor.weebly.com/uploads/1/3/4/6/134639309/zijekaluj-rajabugi.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/mhfjghc/football_champions_league_point_table_2020.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/1379567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_6055bc67b59f6.pdfIn PDF document text
    • http://nesadurem.22web.org/pumedudozoleverufezal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_606b91ffc8bac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fcb23e1968a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_602d2f98ac198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417814/normal_5ff8f4e495038.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://s3.amazonaws.com/bofake/salario_policia_rodoviaria_federal_pernambuco.pdfIn PDF document text
    • http://mapodivopabo.rf.gd/nibixegasujizivupidi.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/9204643244.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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 4836 bytes
SHA-256: 1e6abc2d74761c36bccccd479672b03be732d0b47de505f010fa3f4a1b5d346e
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 10916 bytes
SHA-256: a5d18c30381522206658257e35348d11eae9a7e685f40db0c9df85b9c5cb30b3
font_02_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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