Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d9416c8d7a9cf3…

MALICIOUS

PDF

112.8 KB Created: 2021-06-03 02:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5721a14163a09f7b7888efc0438a7f84 SHA-1: 744086910cb6e5ff2267aef596ba6fab39eb4474 SHA-256: 12d9416c8d7a9cf39083c56329efcd75556f5592931f81ddf686d41f5fb09957
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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/123?utm_term=transdermal+drug+delivery+system+review+article+pdf PDF link annotation
    • https://rizegenaw.weebly.com/uploads/1/3/4/1/134108854/bewag.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/kededitekilu.pdfIn PDF document text
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/d8f5d8b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxaxufudej.pbworks.com/w/file/fetch/144510216/holographic_will_sample_california.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144498159/9849761507.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/zefofobevakatifuwevix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9fd3ea-f263-4952-b445-8e94c1c156b9/luliwanavegitosibedafob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9169d222-39cf-4283-89df-536a75638265/fox_news_anchors_female.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/how_much_money_can_you_withdraw_from_atm_pnc.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144466938/fovawetu.pdfIn PDF document text
    • http://mutoteja.pbworks.com/f/soxajuwusugozopi.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/15120000747.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144529926/fibexamowi.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/57566286319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25159f8a-4242-4523-bb81-55be5d20544a/rogiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb781676-5272-4c79-986a-4950209aee05/how_to_update_kindle_paperwhite_5th_generation.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/f/44061669464.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144411492/29035849763.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144434877/descargar_super_smash_bros_melee_para_pc_mediafre.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144418794/47384843693.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_off0001788a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1788A 5676 bytes
SHA-256: 1bf9f1a4217760084f0fa4dea201956837b8fc258901ddabff526dcaae6ebd53
font_01_sfnt_off00018be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE3 12368 bytes
SHA-256: b7743e1dd82ae22c9157538442a0fe4e232a82828f1978f6af142cbd6c6543a4

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