Malicious PDF — malware analysis report

Static analysis result for SHA-256 f617c1fec862ca2e…

MALICIOUS

PDF

79.8 KB Created: 2021-03-09 21:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b47ab8696c3daa7a362f61df1c09c5ee SHA-1: 10e2a7de47ed590cf39a5a256d1c74321e229235 SHA-256: f617c1fec862ca2e8b33440f9ab24207346c52b7cb839ad298b09b88e2deb189
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9999

Heuristics 4

  • 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://crophysi.ru/123?utm_term=bigo+live+old+version+free PDF link annotation
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/9535089.pdfIn PDF document text
    • http://mif-smeh.space/vegevi8tzuz.pdfIn PDF document text
    • http://presalle.xyz/true_caller_id_software3m281.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/can_you_whitewash_with_chalk_paint.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/0b3fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muluwokixo.onlinewebshop.net/is_salems_lot_a_movie.pdfIn PDF document text
    • http://puguvapalovuzub.rf.gd/90190973506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806d2fbb-9965-468b-8a24-76dd5d19f4de/how_to_create_a_meal_plan_to_lose_weight.pdfIn PDF document text
    • http://xajetizefo.rf.gd/98452229834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4498eeb-f9c3-4890-a498-7859507a86fd/what_grade_is_lexile_1200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5d02d8-b09c-4e2d-a640-7770a9744193/nordictrack_a2750_pro_treadmill_for_sale.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/janik.pdfIn PDF document text
    • http://xatamiv.rf.gd/3781162445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3a7896-a152-4a8d-92a4-ebff92e5e278/lufavigofidabikisadix.pdfIn PDF document text
    • http://sidakofonol.epizy.com/elite_dangerous_ship_progression_guide.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/60802502465.pdfIn PDF document text
    • http://jokosen.atwebpages.com/what_does_d_day_mean.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
font_00_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 4972 bytes
SHA-256: 4ab75c4b4cf88f28ae23fdbb901fa2a7903d20c1c2989aa684c4f21a656ffc7d
font_02_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 11312 bytes
SHA-256: 9f2c61932d9dffaa102b8bc28811f87825b921d1da279d06ab7f9ce4441e834d

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