Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f5adddb95e38dc…

MALICIOUS

PDF

73.5 KB Created: 2021-02-17 02:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1baa989018e8e2030e208b53e4910406 SHA-1: c7ce5255ae7fe52a93df6ab921c5013e36bf9527 SHA-256: c2f5adddb95e38dc3634e3d66ab23b576e72dc3afcc5e7b03a6711070f2174b1
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm. It contains a large number of embedded URLs, with at least one pointing to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://yafferge.ru/wix?keyword=asus+vn247h-p+hz In PDF document text
    • http://umniashka.ru/sunday_school_songs_whisper_a_prayerq4h03.pdfIn PDF document text
    • https://zigudawaza.weebly.com/uploads/1/3/6/0/136035030/4926656.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/ahhHjfI/zomuwexodewepavepekudit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fcd784ea84e9.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/QKkZhap/live_tv_app_for_firestick_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_60177415394a0.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/iCK01ia/lepepopiridozakefupikoz.pdfIn PDF document text
    • http://fimuvukabiwijad.22web.org/jilasewaletopodilajoro.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/bF4gdhh/mudarazusaverebonaliz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5ff414177cac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_602acebd8e296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_60151d2e8a8c6.pdfIn PDF document text
    • https://megewesaj.weebly.com/uploads/1/3/0/7/130738707/gidivakupukoze.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/hijdomT/kill_ragdoll_unblocked.pdfIn PDF document text
    • http://uniques.space/wifi_ifre_krma_program_indir_pc_tamindirou499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_5fd2c44e9758b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454054/normal_5ffe727560282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarajemewowin.rf.gd/fudefo.pdfIn PDF document text
    • http://nikavavufuxirel.epizy.com/black_and_white_board_game_template.pdfIn PDF document text
    • http://xojurasonalefan.rf.gd/negovolipupuredoza.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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 5000 bytes
SHA-256: 4c811f5321670fd76e9fe424b92b2da248dda288402dc37feaec2b8e44aaaea6
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10788 bytes
SHA-256: d50d7abdcb662f890ea8fb2ae0922ea89bfacbfe1a9c7cc8a285e85dd2331980

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