Malicious PDF — malware analysis report

Static analysis result for SHA-256 059b12fa3fcd0f5a…

MALICIOUS

PDF

85.7 KB Created: 2021-04-05 12:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2049b4ef106d2b87ab97cecf36526763 SHA-1: a4e87da4923943ef8231e55a39263d8bb73666fb SHA-256: 059b12fa3fcd0f5a2ea9c0617ffb02e944d844a22d9512d1c24154aa11d7cd0b
186 Risk Score

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 0.9994

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/123?utm_term=nfl+playoffs+predictions+bleacher+report PDF link annotation
    • https://xamifixi.weebly.com/uploads/1/3/1/8/131871938/wuvijudetapilik_ratose_bivawu_xudil.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/8igjjj9/spell_pencil_case_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/darekomeguv/5IDA4SB/22209421035.pdfIn PDF document text
    • http://ig-about.net/wuzumuxewutmlns.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/tyAifqb/the_jackbox_party_pack_2_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/anSheqV/cosmis_racing_xt-_206r_black_chrome.pdfIn PDF document text
    • http://batmbatm.ru/why_does_my_realtek_audio_manager_keep_popping_upnycer.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/7a946592fb.pdfIn PDF document text
    • http://agreevudb.rest/bobikasomupazivopudopifabujeth.pdfIn PDF document text
    • http://circleshtang.xyz/offroad_bike_race_3dy7vc1.pdfIn PDF document text
    • https://sasasazar.weebly.com/uploads/1/3/1/3/131383954/3094700.pdfIn PDF document text
    • http://wdd13.ru/3946508842edewr.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/14de4f679.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/sJhfghZ/68644179449.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/jf4geif/kudarutaran.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_125f48abc2aa449682a1de4e3989c950.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_7fc68968091946448b86e98738f703dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/gafotenujejivanodup.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/dispute_resolution_skills_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/sulopuvunoxuzi.pdfIn PDF document text
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_ee68ac3883f04e5baa8ded546fde78bd.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_d4f1a5a155634c0f95ddf06585d3502e.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_6d451423a29c4019bd7fa6a2c83bc619.pdf?index=trueIn 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_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 5452 bytes
SHA-256: 04ddb90c550816fec7537c4057946e7a58838145e23007cf927b18abfd606064
font_01_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 11496 bytes
SHA-256: 886f9ff3cbe8e4c50e9f290ea7654bbd376e6b7d4cd32b2b89ad8e9c87dcddb2