Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65c73ce25eda097…

MALICIOUS

PDF

95.6 KB Created: 2021-02-18 22:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9afbc121c5c56a67bbcbd456802f6677 SHA-1: ac7dfb9922e095cf9080efbd55a806543b9eb3fc SHA-256: a65c73ce25eda097efabc42917528ca7f8f7b5903587afe162a53708378353a5
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Virgil aeneid book 11 commentary' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to a link farm. The presence of numerous external URIs, many pointing to disposable hosting, further supports the link farm hypothesis, likely intended to distribute further malware or phish users.

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://jacksth.ru/wb?keyword=virgil%20aeneid%20book%2011%20commentary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425926/normal_60261daa3c995.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/JiaKjbf/61174884708.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/ggjgXje/top_scorer_premier_league_2019-_20_table.pdfIn PDF document text
    • http://desekikimok.22web.org/tigaguxuxiladisesin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_600097ca91276.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/JghXMjh/vpn_private_apk_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/Sysgfhe/66539767985.pdfIn PDF document text
    • http://todolosepaxo.iblogger.org/bangla_kobita_image.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/5hjjejh/zed_runes_mobafire.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/dixaleko/72158312482.pdfIn PDF document text
    • http://suzawelo.epizy.com/23403059731.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/39579789021.pdfIn PDF document text
    • http://nimobavaze.epizy.com/dawufakerofopizife.pdfIn PDF document text
    • http://bibuligo.epizy.com/pawonuvitojumave.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/93866182100.pdfIn PDF document text
    • http://kisezemewarajox.rf.gd/kaththi_sandai_tamil_movie_free_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/bollywood_video_song_hd_720p.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_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 5404 bytes
SHA-256: 168c21d003aa2fa0af808970c4eba850488f7a60d48c8d2111f52acf98eb65a4
font_01_sfnt_off00014573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 13324 bytes
SHA-256: 729dd820a1d180345f74bee4e158e1d5b3cd9272b0491c0a7a55d50af5d4f028

Open this report in the interactive analyzer, or submit your own file for analysis.