Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d54070798de07a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 19:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 15577bd2b3bf16627ce1abbae9cfe86a SHA-1: ed5467392d54c1ce2a335db11455b87f1ada9b1e SHA-256: 50d54070798de07a077b8afffe6d0d38cd0e599778aa93d2530cb43da496cbc0
156 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://golowaki.ru/123?utm_term=app+china+apk+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443574/normal_60325fd447e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_6008b15ad9e07.pdfIn PDF document text
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/duraliguvuzaxu-vajarowebag-javujexelu-kemuvebifeguxul.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/6080349.pdfIn PDF document text
    • https://libazuzed.weebly.com/uploads/1/3/1/4/131410812/sipeku-buzoradoluz-lesaxadebebijus.pdfIn PDF document text
    • http://instapodarok365.site/the_5th_wave_series_movie_sequelkqhnd.pdfIn PDF document text
    • http://kmikaerfs.ru/tezenupawofito3slx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_603c780931d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494452/normal_60220f9695933.pdfIn PDF document text
    • http://newser.site/whirlpool_washing_machine_drain_pump_locationajhr7.pdfIn PDF document text
    • https://fadesirowawilej.weebly.com/uploads/1/3/1/6/131606674/45b2999.pdfIn PDF document text
    • http://trixy-matrix.space/bivegifilifelonukajkqd5k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_6016157c3fc47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jusuberu/los_seores_del_narco_resumen_captulo_3.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/gumimokiperotuji.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/58840119870.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/16369504809.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/attu_movie_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/46162928324.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/bubble_gum_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/marvel_spider_man_ps4_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 4676 bytes
SHA-256: 68392ea4cf78a1036dea6bfd27dba7c2d348bfbbbeef05fa67a0a4cd489b5fdc
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 11032 bytes
SHA-256: fc88c09768cf8d46d16d4da8eee73af024b91b3c6e13bc79c195c9ca90bcf536
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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