Malicious PDF — malware analysis report

Static analysis result for SHA-256 71819efab96893ae…

MALICIOUS

PDF

75.0 KB Created: 2021-04-04 16:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6b451d8cdca2293862593a760aad18ae SHA-1: 94d2480e0da21c8c6212c8c643f138ed35664a66 SHA-256: 71819efab96893ae7b7f1c372c5c084837795c9433451c6812e397e85dd10491
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/strik?utm_term=positive+emotion+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417537/normal_600f548358817.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/dipolejaxidajezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_600ebcbab703e.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/vegabejitekoxetebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_6016e2fa6c4b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_6049b4ca25493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_6001a4f02054e.pdfIn PDF document text
    • http://pixekabafan.iblogger.org/nonenuminuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_603e27ae82021.pdfIn PDF document text
    • http://tajasilikiw.22web.org/mba_thesis_on_supply_chain_management.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/derusubow.pdfIn PDF document text
    • https://wivixilor.weebly.com/uploads/1/3/4/3/134371520/4d4b233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd1c33ed8c7b.pdfIn PDF document text
    • http://vakimudefevu.22web.org/cambiar_de_a_word_en_linea_gratis.pdfIn PDF document text
    • https://xopuwofotore.weebly.com/uploads/1/3/1/8/131871456/tizub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peforuk.rf.gd/kenmore_mini_ultra_sewing_machine_parts.pdfIn PDF document text
    • http://lojeler.epizy.com/future_authoring_program.pdfIn PDF document text
    • http://mowosafawun.rf.gd/crysis_3_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/perfume_the_story_of_a_murderer_2006_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/29514879684.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_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 4588 bytes
SHA-256: 7964b3b980afbc27766dddce90a86a8d81bb798839b6909672dd4e1f7489ec4e
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10288 bytes
SHA-256: 86169087f136bee4e01d6e02313dfc277da477d94ea2086f8fde1156273236c5

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