Malicious PDF — malware analysis report

Static analysis result for SHA-256 d753688dc2eb8aeb…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 03:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: df38cbdc25c4f5b51d36e762910f670c SHA-1: dcf2e37fe609f50a223656c15728c068daf13d8e SHA-256: d753688dc2eb8aeb501d096bfd3ac6dde7cfd54ac6ab6671e87e35a4d271e888
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads.

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://golowaki.ru/wix?keyword=education+in+america+by+readworks+answers PDF link annotation
    • http://namafafiteg.mypressonline.com/chuyn_t_file_jpg_sang_trc_tuyn.pdfIn PDF document text
    • http://ferabugajefelam.mypressonline.com/aplasia_cutis_congenita.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/anxious_for_nothing_free.pdfIn PDF document text
    • http://tebivumiwutuf.iblogger.org/94023483628.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/compelling_conversations_book_free_download.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/thermo_king_reefer_unit_codes.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/64459119245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilowovuv.atwebpages.com/nadawesofivun.pdfIn PDF document text
    • http://vefejabenu.rf.gd/resiravosonaleg.pdfIn PDF document text
    • http://gajopule.myartsonline.com/does_jersey_mikes_have_free_delivery.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_e8e3888d266447978459a8f2583b0237.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/kasozifowuwelozixixuwu.pdfIn PDF document text
    • http://pojiger.rf.gd/83059906667.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_e0612a1a19c54f8388dd99dd93e0aec9.pdf?index=trueIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_8125c784996947e299e09b9979186fc8.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/83627674082.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_e0bd83715f1f468299f1c3f7ccac7953.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/present_perfect_and_past_simple_exercises_worksheet.pdfIn PDF document text
    • http://zewixezix.epizy.com/how_to_become_a_vet_assistant_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/fragmentary_passage_guide.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_60b8c2d0cc854c7c99beacad828c60d1.pdf?index=trueIn 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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5408 bytes
SHA-256: 32a7d41615009f2e0b8983dfc4f505ceb9d58d3783a885825d7da6bb28c36bce
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 12208 bytes
SHA-256: c81e71d4d067cb8cf03c85baa845505ec9833790e930f5666d03dfbd95cc13bd

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