Malicious PDF — malware analysis report

Static analysis result for SHA-256 0726e81c33a01590…

MALICIOUS

PDF

82.1 KB Created: 2021-04-07 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3c862522a3c7e3c7e193f6cd4568c4d SHA-1: 987b8a0098df10747422f65629cb00828a93b025 SHA-256: 0726e81c33a01590476dc1636e0c9a7dddf2f09abb115a4297aaa56126ba59d7
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 0.9993

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://fokemale.ru/award?keyword=file+pdf+chuy%25E1%25BB%2583n+sang+word+b%25E1%25BB%258B+l%25E1%25BB%2597i+font PDF link annotation
    • http://suniduno.iblogger.org/vijizojibazajakefugubuka.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/gh5zpI1/nixalunewetigiwubugeli.pdfIn PDF document text
    • http://biomanua.website/papulubalanoximada5o3wt.pdfIn PDF document text
    • http://trokot-online.xyz/21659807765mh1sk.pdfIn PDF document text
    • http://ejinaya.com/jovipuzanojirifukegesizoej8ji.pdfIn PDF document text
    • http://lastasked.com/publix_employee_federal_credit_union_routing_numberp1zn1.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/ibhejbG/glitter_background_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/jeJ5VYL/country_music_radio_stations_in_my_area.pdfIn PDF document text
    • http://meetsol.xyz/kumapawerutoxekagn470c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_694dc75cefae4c1b966832d1a4c917e0.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_40207889962d416b9cdad61cef61dfa7.pdf?index=trueIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_802bffa68dc448e69b99b1f55213a994.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_f93ce4eea858449cb2958e4e94d877f7.pdf?index=trueIn PDF document text
    • http://sazitoza.epizy.com/public_finance_and_private_finance.pdfIn PDF document text
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_ee20f7fd3e3146678d00ba0320c2f018.pdf?index=trueIn PDF document text
    • http://sutuguve.rf.gd/echo_srm_225_weed_eater_fuel_mixture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4e213f-df7a-4a58-9b24-dff0774957ec/how_to_talk_on_cobra_walkie_talkies.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_5f0498d7509a43c5903c468214559744.pdf?index=trueIn PDF document text
    • http://wudokuzogikozu.rf.gd/pugudotateg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726c1809-524c-4e04-8bb5-c60d62c145de/xobepawufiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab656c0f-812b-49e5-b812-66d31595a8be/20033849372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9384f5d1-924c-41c2-81be-2acde5c1b62a/date_meaning_in_hindi_fruit.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_75e296093fd64af08950d3565b0ae8e4.pdf?index=trueIn PDF document text
    • http://xafonabikox.rf.gd/51041460641.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_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 6232 bytes
SHA-256: 2c1a7023f5ce1abd5975b45a865c793dc8717c775c335a361e450e28dd841125
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 24216 bytes
SHA-256: 9d0d641f5d04acfa21350f66ba3cbb3a843050a3594a19d7745bb471c8e5325d