Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77b6c8de82a38d3…

MALICIOUS

PDF

81.1 KB Created: 2021-05-03 23:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5cb50a71b7c5eb9fe50aac6521ba2ce SHA-1: a8f05090941bc0a8732604f2fb9e7a154206be71 SHA-256: d77b6c8de82a38d3b4497ca930ed48ebe8b30283d28b92996a3c2c4975d03995
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://nipisod.ru/strik?utm_term=how+to+build+a+website+from+scratch+wordpress PDF link annotation
    • http://bio-ita.fun/washington_post_subscription_customer_service_numbervnuce.pdfIn PDF document text
    • http://nikecortez.net/71708477440nvmgp.pdfIn PDF document text
    • http://swiss-family.space/bruce_lee_death_reasond9h39.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/trastorno_de_ansiedad_social_2020.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/57740658456.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/bibeli_mimo.pdfIn PDF document text
    • http://ecoservice-vlad.ru/xawefen1v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_602e6683dc17e.pdfIn PDF document text
    • http://216tilford.com/38528169103686h8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_60605d4eddc96.pdfIn PDF document text
    • http://neojust.ru/zikuxaa5z25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5ffb25b0621dc.pdfIn PDF document text
    • http://passive-income.ru/4_pics_1_word_level_21563gizt.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/979ae510-16e4-44c5-855d-3cba7543ce04/top_self_propelled_lawn_mower_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963811c1-3d66-4371-9a12-7ae6f86c17d3/43301490913.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/louisiana_fishing_game_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/glioblastoma_multiforme_new_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d74207a-5127-4c5b-9bf3-cbfa14becd3d/lemujol.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/dawafefubutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5553381-77e3-406b-92dd-b2c1702fa4f0/99665218717.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/who_makes_ralph_lauren_purple_label_suits.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_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 5588 bytes
SHA-256: f4948acaa17da9758deaa7430578390ccce674e9c2517a42e5c8a7c33bc8c381
font_01_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 10944 bytes
SHA-256: 6452d2cf37f5d4bd998357fa4ba2cd44498b26932f5ddcbfe67e1335e86f95f5

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