Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e34ecb750a632a2…

MALICIOUS

PDF

110.8 KB Created: 2021-04-04 07:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c394fe310765fc415ed404ce306ebf9c SHA-1: a5826c14715ac2abcdc3162b9cd8e2d62b577645 SHA-256: 6e34ecb750a632a27dc0156d405890daa016afbd6398d87b410b920fc4bdd7c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The presence of external URIs and a 'download button' lure suggests an attempt to trick the user into downloading a second-stage payload. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings indicate a malicious intent to exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/award?keyword=cambridge+advanced+students+book+pdf PDF link annotation
    • http://ruvujagefeko.mygamesonline.org/merge_online_free_200mb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_6028f59330d33.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/altered_traits_daniel_goleman.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/dukuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_604d1cea62754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_60591d3e1d0b4.pdfIn PDF document text
    • http://tepafuvofes.iblogger.org/timex_nature_sounds_clock_radio_manual.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/3081415481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_60621f4c7b25b.pdfIn PDF document text
    • http://zegosuvavanow.22web.org/presuppositional_apologetics_stated_and_defended.pdfIn PDF document text
    • http://votixowet.22web.org/injustice_gods_among_us_apk_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_603b0dbe19bdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizadopozi.epizy.com/73694046256.pdfIn PDF document text
    • http://zamutodud.rf.gd/accp_guidelines_warfarin_overdose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da134f18-b80f-4daf-a58b-143fcae10e6e/what_is_the_most_abundant_waste_product_of_metabolism.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/what_is_the_origin_and_etymology_of_georgie_porgie.pdfIn PDF document text
    • http://lojarine.epizy.com/nuxinoxoverore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67477830-26dc-4d38-97bf-9be93f91fd38/wugatitojiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0919431-f9f6-4d63-bceb-3f60e6325b4e/xavinavididuresowomo.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/dakesowokadosimotoredebej.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/amortissement_des_logiciels_informatiques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11449c42-d5b5-429e-846a-75b7896a7536/24416351407.pdfIn PDF document text
    • http://beranaja.epizy.com/52122901565.pdfIn PDF document text
    • http://dereduvate.epizy.com/sdlc_agile_methodology.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/kufagigaxifomizemuwije.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/who_plays_zu_in_the_darkest_minds.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 39304 bytes
SHA-256: c5ec073ff79f2cba6e436c210eb0be3c2599628855e16b73acd4299e2e9c5cb4
font_01_sfnt_off000172ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CA 5612 bytes
SHA-256: fabbc3fae7660dfc5e32a2086f968482ac5218126e92660f93732492f2a3c345
font_02_sfnt_off000185cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185CD 10936 bytes
SHA-256: 1f59f51061bac97220bf9379acde14c659ef61b14447ec58bd19019f28843576

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