Malicious PDF — malware analysis report

Static analysis result for SHA-256 b256ccb34bca17e4…

MALICIOUS

PDF

132.7 KB Created: 2021-03-08 07:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b077ffc5ec438d171f31a91c398b8758 SHA-1: e435ec9581c70503ce46bbc11f9104fc0e00832f SHA-256: b256ccb34bca17e458559611fba583b658e3981c5c04fa65a2c545d6b79809ec
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to education, which is then used to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://xajibur.ru/wix?keyword=how+to+get+a+real+education+summary PDF link annotation
    • https://cdn.sqhk.co/xokipuxat/gdjbsbA/89060850792.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/vogaxaxekem.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/geTjahj/33789215748.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/jsmiihd/rc_nitro_engine_size_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jihctRI/romona.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/harbor_breeze_remote_ceiling_fan_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/hgXVgd1/bodebuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/jegepji/los_simpsons_tapped_out_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/ejahd21/rodazebozi.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/1bggahc/47945337323.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/P3GrigX/ramudi.pdfIn PDF document text
    • https://cdn.sqhk.co/pejasibupap/icjaQhb/30731230747.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/YibhhKT/lodaxukekapot.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/gicjfgc/best_slot_car_games_for_android.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/gedesisumi/jekadofosepexuwamona.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/toto_toilet_st743s_parts.pdfIn PDF document text
    • http://gubadif.myartsonline.com/sadekosinukoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624c7b83-81d0-42c1-976d-8c63ea52c416/69058267024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abb4fd0-99bb-45b6-82dd-8383c9999eb4/fizevazezonadadis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94df992-1b99-40cf-92ad-50cb96240629/how_to_use_gibson_g_force_tuner.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/rijefirisitu.pdfIn PDF document text
    • http://damowepoko.myartsonline.com/what_is_penal_labour_system.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_off0001cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBEC 5416 bytes
SHA-256: dbc2508764884288839ba219d57fcbc43821cec97d307b5d138594927cfd12b9
font_01_sfnt_off0001de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE5A 11308 bytes
SHA-256: 95f95d99bbf0681cc37ce67b509690e0592f8f58d513a36a1df16639e9ce4009

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