Malicious PDF — malware analysis report

Static analysis result for SHA-256 de383f5654459d2c…

MALICIOUS

PDF

89.8 KB Created: 2021-03-15 20:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 083fb80d1a171622da3d9447dae483da SHA-1: 50bf2ef6e28b1b469ebf284a6e7a1d970ef8c513 SHA-256: de383f5654459d2caf61ba8534f137990481c633d4d76d6f54bf1e3c6a7104e0
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=active+directory+basics+pdf+microsoft PDF link annotation
    • http://kersita.fun/math_flash_cards_for_first_gradeynnu2.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/gikazujinumuvil.pdfIn PDF document text
    • http://stroiline74.ru/37661173801qifil.pdfIn PDF document text
    • http://ampinternational.org/wogekafepodabixuvufomiors7c.pdfIn PDF document text
    • http://help-mediasupport.com/depulaxabutaxawasaxif48cys.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/cN1hgWM/hero_xtreme_200s_mileage_quora.pdfIn PDF document text
    • http://sungo1.space/wado_ryu_karate_bookrja2o.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/dECSfQU/my_little_pony_princess_twilight_sparkle_toy_reviews.pdfIn PDF document text
    • http://rankingcoach-seo.com/delonghi_gas_heater_reviews1mlkq.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/f2hcQtC/82658755615.pdfIn PDF document text
    • http://nigma24invest.online/tifofejajazuboxitufilegexsszk.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/81798342188.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/nawuzotowinidudixofas.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/chaar_sahibzaade_1_filmja65z.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/ad44d01b-27c5-4dc7-bdfb-e85603a02c78/how_big_is_omnisphere_2.6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15cde574-cc64-4501-9088-a6349e2438bc/how_long_do_adderall_withdrawal_symptoms_last.pdfIn PDF document text
    • http://vidoniwofunevan.onlinewebshop.net/29151751006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c6fbfd-4a7f-46b6-9f19-aa610f55eecd/64723947551.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/63934792440.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/59775551770.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/xopumivadunivuzerug.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_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 5560 bytes
SHA-256: 17d4b1d59a6ec611fcbf945c2ce80bdef09f8824002059f0bf5901be16cc157e
font_01_sfnt_off00013202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13202 11220 bytes
SHA-256: 111e35c61c8d8aae6b7ddc90aa9ac7c4b1bac4d5b86d7e0c4fb0ba718139cd89

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