Malicious PDF — malware analysis report

Static analysis result for SHA-256 d126ac70755e2c9e…

MALICIOUS

PDF

83.4 KB Created: 2021-03-24 06:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dfcaefee8db6d229366eb0b4126ac9e5 SHA-1: ea10f19a494e2ad427360bf82754e0e3bef8b184 SHA-256: d126ac70755e2c9efc81e91c51e7b8d61e237e847581559fc746e3249e36210d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to mimic search result snippets, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=phet+simulation+balancing+chemical+equations+answers PDF link annotation
    • https://cdn.sqhk.co/jafetegupam/fyjgvJg/mumadefajigov.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://coolvdomaion.online/683039136068ycir.pdfIn PDF document text
    • http://dfds.in/lomubufx2rg.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/jurnal_bartolinitis.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/jiihieF/flappy_dunk_mod_apk_download.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/what_does_netbios_over_tcp_ip_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/FjgghFM/wurudemujarigijino.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/pretty_little_liars_box_set_books_1_to_4.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/jahjjeR/53440374981.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/what_footlongs_are_five_dollars_at_subway.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/nimawivukepo.pdfIn PDF document text
    • http://mybestchan.online/lexus_es_350_f_sport_msrpfainc.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/hhSgdhi/buzopi.pdfIn PDF document text
    • http://fogarapisow.22web.org/sengoku_basara_apkpure.pdfIn PDF document text
    • http://dogebidogapiduf.22web.org/the_biblical_counseling_movement_history_and_context.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixutixiziv.epizy.com/26014354252.pdfIn PDF document text
    • http://lujonas.rf.gd/28873012257.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_c3c5dabac56d4fa3a0309759c3a8748e.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_274cb89ebbd84e2b86dd1e8cafe4727d.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_c74058d979934c8f9db35e74b2df52df.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 5572 bytes
SHA-256: a10f14d3cd4989d3a9419e83b85c52c964fb1f570c0c159714c6ec5e9b97d6e4
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 10496 bytes
SHA-256: 739d651ca39402c84a012384e3669de43e92844a00ebf53737565331ed255797