Malicious PDF — malware analysis report

Static analysis result for SHA-256 b128c2019dcd3fe1…

MALICIOUS

PDF

90.8 KB Created: 2021-03-18 12:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a67ad61cbe30dd777142211f9df715a9 SHA-1: 6d9661bc2688c04b439217f940d5d6255c1074fa SHA-256: b128c2019dcd3fe15287d5004c3c7dc169687ff5e4118fea5f01284d18aef6f9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links and the redirection heuristic suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=drag+v3+hacked In PDF document text
    • https://cdn.sqhk.co/muvotugi/gigjfor/music_video_maker_free_download_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/dhjia2u/flip_water_bottle_toy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377908/normal_6004a43fa2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/jgjNfja/flower_care_bear.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fd14bf842952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd6452abe5b6.pdfIn PDF document text
    • http://bivebojulop.iblogger.org/bajaj_finserv_emi_card_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/fjbicSz/why_does_kitten_run_away_from_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_604204b607ead.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fed465429532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_604719280989e.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/jhe9oBk/44539666308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_604a29c03eaac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_603cffe2e95a6.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/jhapihY/jungle_knife_hit_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451044/normal_5ffed2fea1812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepesuvapedese.epizy.com/que_son_las_bacterias_coliformes.pdfIn PDF document text
    • http://galapeb.epizy.com/guxedasokarosikiwar.pdfIn PDF document text
    • http://dubirapotemudi.rf.gd/40005316929.pdfIn PDF document text
    • http://nimoxorud.epizy.com/python_format_c_code.pdfIn PDF document text
    • http://duzuxaxuba.epizy.com/free_bootstrap_3_responsive_admin_template.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_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 5276 bytes
SHA-256: f64daa7667fd72ce7db71e91d28cf1cd61e6b29be41a21e3fa7265349e0cbfec
font_01_sfnt_off000136d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D9 11608 bytes
SHA-256: 62bbffcafd64e6e5afee8234e5a847325ee06ea5a26030fdc4679b43c0e9677b

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