Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe8cd5617a8e3bf…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 07:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b37af1fc582e95558db013cdc07cf37 SHA-1: 70638e0fad1ef5cbc2fa35977b50ccc96d0ec1c9 SHA-256: cbe8cd5617a8e3bf59e9c92edded0464912b8c8c4cd6da375eb536af43024db6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=apocalyptic+super+system+chapter+23+english PDF link annotation
    • http://zespodsvetkoy.site/52560471755zxf9f.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/ihmhedZ/wrecked_island_survival_sim_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/c5gebhe/9099499085.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ehicXvs/jufotixexaruzenuxubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_5fd87faa79c12.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/hdje4jh/race_through_space_game_rules.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469105/normal_5ff64e50bc64b.pdfIn PDF document text
    • http://photoforce.ru/livro_abordagem_centrada_na_pessoa_woodybmmr.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/9jjFmsv/wood_carving_tools_melbourne.pdfIn PDF document text
    • http://like-store.site/xufapoporineketadoxxorq.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/eicSidf/house_designer_fix_and_flip_mod_apk_home.pdfIn PDF document text
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/5611825.pdfIn PDF document text
    • http://bellissimo.online/al_quran_online_30_juz_mp34l3zf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mubefula/xaxidosukijo.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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 5616 bytes
SHA-256: 82b8c781bd8cf4412a95f52e7be1f551a513f5127f3d096d0cd8b554c400a4ac
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10864 bytes
SHA-256: e0f1c1794386dec67f79c4a194b2bc46c96a762f1046a605280d858fa4498736
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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