Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecf33306fa0d8d6…

MALICIOUS

PDF

87.6 KB Created: 2021-03-03 01:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eb896a91905db651797b0eb298742b44 SHA-1: 92c424607eed887fdf94af6a2293b0f0698c8efc SHA-256: 7ecf33306fa0d8d60abc1e501df6e0d2a325ae674bf65f482b6bd0e424a7ab70
126 Risk Score

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 0.9998

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://bologen.ru/strik?utm_term=titulos+de+credito+traduccion+ingles PDF link annotation
    • http://lulopoboxefon.scienceontheweb.net/tozutokapaxofesosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_5fd7bb8980dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_6019c7a05e4bf.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/how_to_multiply_with_place_value_chart.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/44703815607.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/reaction_mechanism_worksheet.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/twilight_full_movie_in_hindi_free_download_720p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_6029c307b0c1c.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/how_to_replace_a_whirlpool_refrigerator_ice_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/2Y3HUAM/talking_cat_and_dog_apk_revdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5fe7156518804.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/the_white_tiger_movie_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevejonitu.onlinewebshop.net/the_lightning_thief_movie_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/cdr_file_free_software.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/85443880206.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/what_funny_series_to_watch_on_netflix.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_much_is_a_box_of_romeo_and_juliet_cigars.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/essential_idioms_in_english_book.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_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 5056 bytes
SHA-256: 6761670e5cb87b2b1d2d7c4dd7932f7e354c282ae48560fbfd3e86481f80b396
font_01_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 12828 bytes
SHA-256: 5b61539b424123f6f2c3083a6772543929ad80aeb457c8b0d39adc70d7e44bef