Malicious PDF — malware analysis report

Static analysis result for SHA-256 a978de66f8da5a3e…

MALICIOUS

PDF

90.4 KB Created: 2021-05-01 04:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51d750d7de71859d40e46933e7704298 SHA-1: 9b447ac02489a4bd51fa456ee4dc8a4f92759278 SHA-256: a978de66f8da5a3e3c44452a2ecaa55468de1d83ebd39f13853f0a8cd0ecd497
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 0.9997

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://jottigo.ru/strik?utm_term=mooligai+maruthuvam+tamil+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/xamitarerivu/ehe3SiG/mandatory_reporting_training_wa.pdfIn PDF document text
    • http://scrlt.xyz/57170953902oz27w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_605229a882057.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/jhWAEjf/26946897752.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/FhcLABr/ates_ve_su_online_nas_l_oynan_r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_60339a8134062.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/qHyjgTs/scoreboard_basketball_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/jb32jah/jerudo.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/icZhjnn/draw_you_out_synonym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_5fe634876b912.pdfIn PDF document text
    • http://help-service-support.com/saints_row_2_xbox_360_cheatsv8f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6027542fde31e.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/gYW1ghj/best_wedding_anniversary_cake_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_60384547460c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_60143a78b439d.pdfIn PDF document text
    • http://xuzunebizojebab.22web.org/fobezumim.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/ibajhhf/junior_graphic_designer_salary_san_francisco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_60058eb071ba3.pdfIn PDF document text
    • http://hookup157.fun/quotes_from_the_selection_series_with_page_numbers1fpbg.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofijanititad.epizy.com/jedemudinenevituwewera.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011521.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11521 14588 bytes
SHA-256: 89a4d19f419c14946aa4f7fd1e665c6b172bf58c685044168f2c4fc7b5dbbd45
font_00_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 5432 bytes
SHA-256: f7495e0fc9ba82e5b35835cad6b439b08d0021261708facb01db4045840bbaf2
font_02_sfnt_off000138bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 10296 bytes
SHA-256: ef0ada49852e745dce2a0094fd94cf147b86894545d31db4e837e104387370b4

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