Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f94eba518a4432…

MALICIOUS

PDF

85.6 KB Created: 2021-04-13 12:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cac6bbc236f23c2ece7469356c877e21 SHA-1: e7b11ed5e5e03215ad11aa3c5386ab84c19644ed SHA-256: 23f94eba518a4432734e280a3f8ecb531d6f7cf00533908b2e148631b8144f1f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains multiple external URIs, including one pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The 'SE_CLICKFIX' heuristic indicates the document is designed to trick users into executing commands, a common social engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jacksth.ru/strik?utm_term=hp+officejet+pro+8600+not+printing+color PDF link annotation
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/zazobabutino_bivipukimomax_tomaguzu.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/62256089212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_606b7a72a58cf.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/vewotajufevara.pdfIn PDF document text
    • http://jewlgems.com/vekewewobikigokape99j4k.pdfIn PDF document text
    • http://turistik-a.ru/gaxunefkw8wk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_605effe95ad01.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/44486780050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_606621ee2712f.pdfIn PDF document text
    • https://radebijudowax.weebly.com/uploads/1/3/1/6/131607027/rusuluxeja-zuxugugisu-fepowijeba-linaboxom.pdfIn PDF document text
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/2054399.pdfIn PDF document text
    • http://tranquils.space/38395714502nnmu4.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/ratominelubisidavi.pdfIn PDF document text
    • http://kartaidatodemeleri.com/verbal_reasoning_tests_for_11_year_olds1rr1j.pdfIn PDF document text
    • http://megantv.site/coleman_battery_guard_lantern_1000_lumensbxc4m.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/free_java_books_for_beginners.pdfIn PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/voziroza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_600cf3863a146.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/blackbird_guitar_alliance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nevowimo/6013929389.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/power_book_ii_ghost_episode_7_preview.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/38879727101.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/95173208562.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/how_to_reset_belkin_router_f7d3302v1.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_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 5324 bytes
SHA-256: a9ea28f2645dee0324dcc01792eec7657440bf24332cd440ee118030f7c0ddbb
font_01_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 11572 bytes
SHA-256: 9514b07942620146f81fb7a255d49024eb573ea3b66e51a6fa3eb79c55e3e31d