Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a0b0054c669ee8…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 21:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fdff55c2d8fb57d59ab058a04193366b SHA-1: 7f93633ad254471af0d9e20167d24d3d01ffa89b SHA-256: 23a0b0054c669ee8bfe2e7f1a9da831ed89ace6a89c96ea75d6e872a4362ff2b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=google+drive+url+shortener PDF link annotation
    • https://dojixevagix.weebly.com/uploads/1/3/2/6/132682303/wowep_nevixobike_sidemegolo.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/88390367739.pdfIn PDF document text
    • http://zumepelilebatu.22web.org/pevogegavuxil.pdfIn PDF document text
    • http://leniwatojetojem.medianewsonline.com/social_media_and_mobile_marketing_strategy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6017f6f3c1632.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/d3a2145.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/f09shj3/jugar_supertuxkart_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/r3ijif4/yandex_disk_linux_cli.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/gihgPjh/34623871182.pdfIn PDF document text
    • https://dexonakupo.weebly.com/uploads/1/3/4/6/134644734/0bdf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_602db328dfb2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5fca6bcf83ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420911/normal_6044261f10b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_6032a8d26d89b.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/jghI7nx/xonupesimuxag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekuvosaletum.rf.gd/71852939631.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/creative_writing_skills_and_techniques.pdfIn PDF document text
    • http://welokisixipapa.epizy.com/lukoferu.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/leripugakodosezog.pdfIn PDF document text
    • http://bumazuk.rf.gd/magic_call_application.pdfIn PDF document text
    • http://wifuvonuwoje.rf.gd/fufujotowozulumem.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/rapumaronupudavixewojulu.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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 4968 bytes
SHA-256: 1730ddabfd8a05507a0e9ad00c3238e43400b365bcf77114be877f5bcd98b5e4
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 10892 bytes
SHA-256: f3734bdd7ae2df78c97b69d0580eb4e6166d4ba7260089061459eeaf28550331

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