Malicious PDF — malware analysis report

Static analysis result for SHA-256 25574d73da3398c4…

MALICIOUS

PDF

74.2 KB Created: 2021-03-25 07:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 229c79a575fa9243470032e97ccd28f2 SHA-1: 93bb5a8c39784b59f21cf4c24fbc1fccd917522d SHA-256: 25574d73da3398c4de392f39ae5d87cbd3257e03f8993626f083a135288af77e
166 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. It uses a password-protected-archive lure. 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/123?utm_term=primary+colour+wheel+worksheet PDF link annotation
    • http://lnstgramhelpcopyright.com/losiduvitezebepegaha7k7.pdfIn PDF document text
    • http://thiswaytovogue.com/being_on_time_quotes_and_sayings0ub02.pdfIn PDF document text
    • http://verification-help.com/fokukosiwunapenuwuju0gy1o.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/557260454c971.pdfIn PDF document text
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/9749045.pdfIn PDF document text
    • http://kosodidaxelo.22web.org/awadhesh_premi_video_bhojpuri_3gp.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/wunupalezozerud/hp_7520_printer_help.pdfIn PDF document text
    • http://lavewujexu.epizy.com/zoposorofamazibopitezutik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac08de7-9866-4ec4-9d12-f514868c8016/how_to_change_screen_size_on_vizio_tv_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee560fc5-0182-4865-b0c0-85eed96762a3/zosud.pdfIn PDF document text
    • http://wifudozakiteg.epizy.com/92968895566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04672b50-2be3-48a0-92f2-5b49035feedd/lemony_snickets_a_series_of_unfortunate_events_film_uit_2004.pdfIn PDF document text
    • http://tanadumowijilum.rf.gd/56604923069.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/yeh_chikitha_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/jafafiloworabopunimixirez.pdfIn PDF document text
    • http://zokudubogot.epizy.com/61590914016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd70b04-0172-4aa8-bef6-90e4af384860/is_pen_mightier_than_sword_essay.pdfIn PDF document text
    • http://womopemi.epizy.com/refanipamoze.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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 5300 bytes
SHA-256: 82bb04f2ab4f274dca419d12c2827760a4e9351464a0f3220df76ea3d65cadd5
font_01_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 10212 bytes
SHA-256: 8f621445da833eddd9b7e2297be9173182d0eb2f8acd1a4f4131cb7eb5e7989c

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