Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7748f794d6be6c5…

MALICIOUS

PDF

81.0 KB Created: 2021-04-05 03:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8f08eb595cb4971e9fad9a7d0f387f7f SHA-1: 0c7a50f19b34593d16eb042fa4818fea595ccfd2 SHA-256: f7748f794d6be6c53df2365fa2a0742af5d8c135848b5444136f8e4795636231
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. 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 embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://resalured.ru/award?keyword=carte+climatique+du+monde+pdf PDF link annotation
    • http://luminar4-download.xyz/bazivowirewuy6pfo.pdfIn PDF document text
    • http://snatural.space/free_video_downloader_chrome_browserfps2m.pdfIn PDF document text
    • http://reawolt.online/3147481251716kvz.pdfIn PDF document text
    • http://buloshnaya.site/my_contraband_summaryz8mnj.pdfIn PDF document text
    • http://extra-fon.ru/why_is_there_blood_clot_in_my_eyebvkwy.pdfIn PDF document text
    • https://setinedib.weebly.com/uploads/1/3/4/6/134684411/686c8af64efd8fc.pdfIn PDF document text
    • https://wotipufa.weebly.com/uploads/1/3/1/0/131069738/rumiwidogededos.pdfIn PDF document text
    • https://zajuzazoni.weebly.com/uploads/1/3/4/8/134891144/xanefiwo.pdfIn PDF document text
    • http://pokinusuvato.getenjoyment.net/voxowa.pdfIn PDF document text
    • http://reduslimitalia.site/mikedogowifidevoxej3oo4e.pdfIn PDF document text
    • https://milarenu.weebly.com/uploads/1/3/2/8/132814898/1f2960b.pdfIn PDF document text
    • http://aslixan.com/zesirajeval62zks.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/pimuxujenure.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/kisix.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/salemefeno.pdfIn PDF document text
    • http://christinaanddavid2019.com/68801337945zu1vg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/bonjour_tristesse_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbd74aa-b17a-4c00-95b9-5a8de8267627/kuvitulebin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898df6de-1c33-45c2-ae8e-9aa1daba39b4/12244878151.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/wh_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5572251f-d40e-47f3-8725-8192cab84133/58960857716.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/88839615870.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/31869356376.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/naming_ionic_and_covalent_compounds_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/fumobinarategivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ac2e62-d4ad-476f-ae50-55bee8c45552/77904338256.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_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 5156 bytes
SHA-256: a7447c51a00c5fa50b942af53e757e8fea0aeb1c51616d2186d06b6b33453ba2
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 12512 bytes
SHA-256: 3c99fb1fe57cf591b0d68cccaf4a4b8394ad531f435eec6898bf250fe7658e5b

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