Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57999ce8b993381…

MALICIOUS

PDF

70.5 KB Created: 2021-02-01 07:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 185bf56487acba9b6dcafcea769874c1 SHA-1: 338b15ccb9bf834590d64742cf2df2111929bb95 SHA-256: b57999ce8b9933816012ccd42365f54f124ff055c88fc44b761670fd3c2017ce
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs point to known malicious infrastructure and disposable hosting, suggesting an attempt to lure users to malicious sites or engage in SEO poisoning. The ClamAV detection further confirms its malicious nature.

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
  • 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/aws?utm_term=closing+stock+appears+in+balance+sheet In PDF document text
    • http://sportplays.ru/natadufurojaseviiixrq.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/gfvidfH/nyse_stock_market_open_today.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/kidumalosozsgim.pdfIn PDF document text
    • http://8gusevshop.website/beyblade_burst_rivals_download_uptodownydfzb.pdfIn PDF document text
    • http://rewuvov.iblogger.org/sepowipaxemadubede.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/QjiSBhj/stacky_stacking_cups.pdfIn PDF document text
    • http://fevozogu.iblogger.org/architecture_apps_android.pdfIn PDF document text
    • http://businesslinecenter.com/convert_docx_to_apache_poijin7j.pdfIn PDF document text
    • https://faberumul.weebly.com/uploads/1/3/0/7/130739640/03d240.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/jb8ypij/cross_wallpaper_iphone_5k.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/c6kiehc/werurekoveliwi.pdfIn PDF document text
    • http://starconflict-game.ru/powerapps_cascading_dropdown_de_sharg0yiu.pdfIn PDF document text
    • http://praktika-ingenieur.com/33222913370lbkrc.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jbujcli/vofamamibexofere.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/5695739.pdfIn PDF document text
    • http://zoneeuro.pro/gexorunaxefemomukipam0e.pdfIn PDF document text
    • https://luloludelipirad.weebly.com/uploads/1/3/5/3/135318650/ramasiwunonuduj.pdfIn PDF document text
    • https://tonusawojojumo.weebly.com/uploads/1/3/1/3/131384735/079ee.pdfIn PDF document text
    • https://cdn.sqhk.co/xizubutagen/jhd3Hja/wuxujolodijubovazedafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujisovi.epizy.com/bexenipijukepaboxer.pdfIn PDF document text
    • http://menimilerawapo.rf.gd/code_breaker_exam_answers_fallout_76.pdfIn PDF document text
    • http://gasigigi.rf.gd/geotechnical_lab_test_manual.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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 5304 bytes
SHA-256: 6d11b9b637e9e34a3fa59b66bc2732c1a040729f04ae368218443933824f8246
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 11008 bytes
SHA-256: 184c42d8177f9b8c78c4e2f5e8248a6f5a7a8e4e1cb8126a39d4d2ae45874b76