Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd8d401b811fe67…

MALICIOUS

PDF

99.2 KB Created: 2021-02-16 07:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 994e8d5ce5a632f404d4df6385c51da5 SHA-1: 0699d246172181b2734ae7a4cf7b200e06c0b7ef SHA-256: 1fd8d401b811fe673a394d924388d1b31aad80ac0a22fdc91c6aec8675bb3037
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://jottigo.ru/wix?keyword=s+blend+words+pdf PDF link annotation
    • http://topfrag.rip/angry_birds_hollywood_movie_tamil_dubbedeves3.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/metabolism_of_carbohydrates.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/nejakatizub-velipazarozuweb-wofasofibudiw-pomidesa.pdfIn PDF document text
    • http://yazansoft.com/geekbench_apk_size4bh6x.pdfIn PDF document text
    • http://sojipen.22web.org/tajonigunuwa.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/simujix/zugorozebe.pdfIn PDF document text
    • http://kebanibaru.epizy.com/12070135559.pdfIn PDF document text
    • http://govatojajij.epizy.com/gems_of_war_pvp_guide.pdfIn PDF document text
    • http://wokakegefu.rf.gd/fraction_worksheets_addition_subtraction_multiplication_division.pdfIn PDF document text
    • http://jupelujunu.epizy.com/akh_lad_jave_song_instrumental_ringtone.pdfIn PDF document text
    • http://wipitawakewemex.rf.gd/96172803506.pdfIn PDF document text
    • http://segoxegigo.epizy.com/abdul_bari_song_video.pdfIn PDF document text
    • http://sisawujeza.rf.gd/gitidukalipopalozawerixun.pdfIn PDF document text
    • http://tibupud.epizy.com/diremidozowe.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_off00014a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A90 5160 bytes
SHA-256: 21e6fec8fcf750b4b6371ef6dd1a1e69bc9f786338c420d2a4f4dcc2844d796b
font_01_sfnt_off00015c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C35 10476 bytes
SHA-256: aab34b7d36518bacd185c5f8454c8a27e2d9f32ec586f156a863e3961ee5d96f