Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb3514d743aa733…

MALICIOUS

PDF

79.1 KB Created: 2021-03-16 20:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e434571dc7635022268621400c408a74 SHA-1: 386340075982824f0ea770123dfa444edf10e589 SHA-256: ffb3514d743aa733dc0706bd1718a7e8b72c9db721825c218946e575d79b176a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://druttle.ru/strik?utm_term=old+school+cast+nicole+daughter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5ff8ad6c2113e.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/YhjRvD8/farusidenilakedugufab.pdfIn PDF document text
    • https://cdn.sqhk.co/dejegekonula/oohhoja/40566966895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452839/normal_5ff5678d1ab0c.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/ii1jjfy/any_call_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/hhc6ghr/dezuzorinizubezewa.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/singular_and_plural_nouns_list.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/spalding_basketball_system_u-turn_lift_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/ibgfwdG/gojuvikoxojetikafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fc711be330de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damikofem.rf.gd/pbs_job_scheduler_documentation.pdfIn PDF document text
    • http://nonavijewiw.epizy.com/atharvashirsha_mr_jatt.pdfIn PDF document text
    • http://rurodebijusidof.epizy.com/doctor_sleep_movie_vs_book_ending.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/63337859088.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/vector_smart_battery_charger_f02.pdfIn PDF document text
    • http://gidigeja.rf.gd/2020_buick_lacrosse_brochure.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/no_kissing_baby_music_video.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/chennai_express_movie_mkv.pdfIn PDF document text
    • http://moxutomib.rf.gd/21526957596.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/lanuxewo.pdfIn PDF document text
    • http://josesomesube.myartsonline.com/resume_cover_letter.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/jufurufexusijugedowagid.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_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 5228 bytes
SHA-256: aa15d39784a8f4e8fc1e06b29f284475da7bbf738db1f8702c15f130c68d6d49
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 10488 bytes
SHA-256: 209c0d7beede00d006861adbd0dddcf916ca6ee70e7bc97428f3f06860ced21b

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