Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff712e38227eebe…

MALICIOUS

PDF

77.9 KB Created: 2021-02-01 03:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 90e8b95189757d24cee983a867d53f4e SHA-1: 7a918b5a9c3219ddad6abb2069579b8101a76ce7 SHA-256: 9ff712e38227eebea9ca31d6140b36c1d2afa0f487ee0e7a2493c8ad91345bdc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/aws?utm_term=fractions+into+simplest+form+worksheet PDF link annotation
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/b7dac4146fcdf0e.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ejhVjgG/lords_mobile_battle_of_the_empires_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pofevadamem/GjJMojg/kobazegokegibuku.pdfIn PDF document text
    • https://cdn.sqhk.co/muditazu/ha6jibz/beach_buggy_racing_2_cheats_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/BDXUghf/1690591549.pdfIn PDF document text
    • http://6gusevshop.website/julusolusipovewukujifizalxdrxy.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/b73ca3fc60a5.pdfIn PDF document text
    • http://theandyhong.com/54615166763qj6ae.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/jhGGrvd/venus_flytrap_seeds_home_depot.pdfIn PDF document text
    • http://lnstagramoriginal.com/viruses_definition_computerw9nnd.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/ajaSjbC/escape_plan_3_release_date_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/oheAtgh/zafedi.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/buraxovunugit_wezolabop_vubasob.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/pTalhji/95674681603.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/6ieiaif/shogun_japanese_steakhouse_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/6hgghCN/weed_killer_for_grass_in_fall.pdfIn PDF document text
    • http://tronreserve.online/barber_shop_midwood_brooklynk6vhe.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/2570707.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/vogubivajavofu/final_fantasy_ix_platinum_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/xupavaton.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/basic_makeup_brush_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/lunududom.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/rawufajekinapudap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5364 bytes
SHA-256: b48dd5cc56766201cf7907c992b43cba60c41f5ceecd375e3321acbe67538a81
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 10536 bytes
SHA-256: e0ef2f32ee4bf3ffbe3db39ce21277eb1baa5a22bc52473c68b09ece11c409eb
font_02_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2