Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e018981793bf153…

MALICIOUS

PDF

80.2 KB Created: 2021-02-18 21:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6d5ff590b7dd94b4d0fc6c87e74daef5 SHA-1: 1737980a4c9466208c4258c60e9fc1fc0b974e6b SHA-256: 4e018981793bf153ea5b0b178ece6a980f44576da0874d66f03275f12bc55e73
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/aws?utm_term=vivint+sky+panel+cost PDF link annotation
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/bixazorem_xebixevuz.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/7102188.pdfIn PDF document text
    • https://fazozojoxupu.weebly.com/uploads/1/3/1/1/131163788/xobisare.pdfIn PDF document text
    • http://pshcomonhere.xyz/ccna_2_chapter_2_quiz_answersuu3xc.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/e7f131f2d365.pdfIn PDF document text
    • http://natorg.fun/90844475799ajygo.pdfIn PDF document text
    • https://falitevegenos.weebly.com/uploads/1/3/4/3/134321562/rifozilaxiwema_regigokunibaw_rapukeza.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/gihdIT7/letter_format_for_employment_officer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_6012441345194.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/pv6jfib/slice_of_life_romance_anime_crunchyroll.pdfIn PDF document text
    • http://fevozogu.iblogger.org/4679401279.pdfIn PDF document text
    • http://sasavojaraw.iblogger.org/probability_density_function_table.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/gudukupir/customizable_calendar_template_word.pdfIn PDF document text
    • http://rosuvutoxuwi.rf.gd/wufibupuxatozifu.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bleacher_report_nfl_picks_all_games.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_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 5024 bytes
SHA-256: 85a8d5ea13ce703b6b4196c5fc9edf9eff02d87d69733f41bd46f4285665d929
font_01_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 11104 bytes
SHA-256: 220ec67f4afe968a4214230165024243226e0d709304bdf46f24c15bf1a39807

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