Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e333fad60dec5c…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 23:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 400698c9c97c824ce29a4e61e9a3b7c1 SHA-1: a8e88625c9cee3f75deb18849eb5d06cc0ce537b SHA-256: 88e333fad60dec5cdad5040a7254124ded6d012382f146662c1f730e2cdea620
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as an SEO redirector for phishing. The embedded URL, 'https://bologen.ru/123?utm_term=academic+writing+definition+pdf', is likely part of a phishing lure disguised as an academic resource. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=academic+writing+definition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492275/normal_603d409ae55a1.pdfIn PDF document text
    • http://urott-hu.com/goresuzakiwibugf7220.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/95839347245.pdfIn PDF document text
    • http://fastcreditreport.info/notudugasexnnytt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5fe3742ea2201.pdfIn PDF document text
    • http://iglivesupportteam.com/ryobi_10_inch_table_saw_partstr0h6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_60341395a1d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_60414c5a34373.pdfIn PDF document text
    • http://wedavinonuvovu.22web.org/46977237123.pdfIn PDF document text
    • http://antinomi.design/is_vicks_humidifier_goodxbhmg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407301/normal_5fc68df39deb1.pdfIn PDF document text
    • http://monstergym.ru/thermo_king_reefer_unit_doors6r25x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megunowibutik.rf.gd/absorption_of_carbohydrates.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/bank_al_habib_branches.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/ncandweni_christ_ambassadors_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/58159651658.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/zuvugavugakog.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/what_does_a_sub_mean_on_twitch.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/ladesonitoxedaragaruj.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/electronic_signature_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/consort_medical_annual_report_2015.pdfIn PDF document text
    • http://rovuritag.rf.gd/child_care_information_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/world_war_z_game_steam_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/ed_tecnologia_da_informao_unip.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_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 5344 bytes
SHA-256: 90b6d965a2385f99639476e0f9afee429dd40f99ebaa872a71c23847830d3ae9
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 10432 bytes
SHA-256: b9f0c634a7c8c9015c69a8a4ee2c9d3b8cb9071f99511c023a72c908129e20b8

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