Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f14f9dabd82dd19…

MALICIOUS

PDF

72.8 KB Created: 2021-02-14 01:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 01fb02c40a8ffc19b3cce683de379633 SHA-1: c817642318629e690be7bd02eb12a4a6f9a5bc20 SHA-256: 3f14f9dabd82dd1910cf05732f75a706dc5cd9adf285a5d577fffd08e9dcac72
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one notable example being https://jacksth.ru/123?utm_term=epa+safer+choice+label, suggesting it functions as a link farm or redirection mechanism. The PDF's structure and embedded content point towards a phishing or malware distribution lure, leveraging external links to achieve its objective.

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/123?utm_term=epa+safer+choice+label PDF link annotation
    • http://xajoraxi.22web.org/ntpc_dadri_summer_training_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fff3942446b2.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/7djhgd4/beauty_routines_that_really_pay_off_student_loans.pdfIn PDF document text
    • http://finofoze.22web.org/cessna_172s_manual.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/8af7e97df.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/waditotemuz_bubozilomisa_voxapow.pdfIn PDF document text
    • https://ladazogigewor.weebly.com/uploads/1/3/2/6/132681379/742170.pdfIn PDF document text
    • http://bandalet.club/music_notes_treble_clef_worksheetweqlk.pdfIn PDF document text
    • http://damvglaz0.xyz/anjaam_movie_hdd11qt.pdfIn PDF document text
    • http://nosinoski.shop/5713303387hmase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5ff80f6430308.pdfIn PDF document text
    • http://fruits-summer.fun/kupovejavu6ga1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sebafasoro.epizy.com/dawetolixaxiwenasakev.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/33566510012.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/9th_konar_tamil_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/lol_runes_guide_season_8.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/95691563854.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/8088039095.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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 5200 bytes
SHA-256: 1201dbf890543222cbe8679a21ba1ae8152792c7e5ac5f7d0add12e5a7f6bc38
font_01_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 10552 bytes
SHA-256: 78aaf4df5c9d7092f2f5c5b7a763308c3049d54fb90bc736c6f625cd991d5a10

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