Malicious PDF — malware analysis report

Static analysis result for SHA-256 4671333f6e7a7bb8…

MALICIOUS

PDF

100.1 KB Created: 2021-03-20 23:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cc3818a2358f28263953e00a1a835a53 SHA-1: 2f6d50ba041cfdaba30cc49544e9715111862027 SHA-256: 4671333f6e7a7bb8804f26a0f43be8a8aea86164f108792b9ffb0be7669ef8ba
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as search results, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users through deceptive content.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/award?keyword=briggs+and+stratton+engine+manual+pdf PDF link annotation
    • http://cardioactiveitalia.site/neato_botvac_d3_side_brushv7q3e.pdfIn PDF document text
    • http://didazema.mypressonline.com/9491222799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_6005e02da6da5.pdfIn PDF document text
    • http://tryplafond.xyz/white_tiger_hindi_movie_ploth90to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_602addcee79c1.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/sobedusijekitex.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/best_free_guitar_lessons_online_reddit.pdfIn PDF document text
    • http://1eyvgo.xyz/apprendre_le_russe_lecon_3kq5gl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_604f8ca02aa64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_60098973e016a.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/kobalt_12_dual_bevel_miter_saw_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/gZhi9jf/daxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/hejhgfy/bizzy_body_remix_by_psquare.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/EoShfhe/amazon_goes_gold_2019_leipzig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecfe6a3-f2ac-42a2-8a3b-34e49fa7072c/piveduko.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/frozen_flower_2008.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/hp_deskjet_f4280_black_ink_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/58809965626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0276a1e-d415-4de5-8b22-9e5170242764/25683689083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eccf6cd-5d5c-4816-8048-241e354fef3c/how_to_troubleshoot_a_tv.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_off00014a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 5408 bytes
SHA-256: f4b4874cd2e36cb06c08eaba6b86df073dfe32ddbfc279d84958ca38282ef75e
font_01_sfnt_off00015cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC9 11248 bytes
SHA-256: cb2aab10798e94f4c72e7951ba7f286b20e02a81860ca8b72e0c707733feff52

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