Malicious PDF — malware analysis report

Static analysis result for SHA-256 63855e771174849a…

MALICIOUS

PDF

97.7 KB Created: 2021-04-06 14:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ac00532fd90e6e8cdf9f4358b41c123 SHA-1: da2a3845d75d1f964b66356f67744cacde611b0c SHA-256: 63855e771174849ae971f71221f4fb9e8826b4c9f063fec2d52bbd22858b23c0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of embedded URLs points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=conclusion+del+mito+de+la+caverna+de+platon PDF link annotation
    • https://sopogokatoluj.weebly.com/uploads/1/3/1/0/131071191/12a70199.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/irobot_560_replacement_battery.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/66c85f.pdfIn PDF document text
    • http://avtovishki-msk.ru/amlife_insurance_berhad_annual_reportfzavs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_60173fb0dcd6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_5fd24172258a1.pdfIn PDF document text
    • http://lazinuno.scienceontheweb.net/olfactory_neuroblastoma.pdfIn PDF document text
    • http://swiss-gear.store/how_do_i_setup_my_comcast_modemm6mjf.pdfIn PDF document text
    • http://vipadminler.org/69150912816u2qxv.pdfIn PDF document text
    • http://ayazshabutdinov.club/5291616352645ga8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_df7504a06d6e4d3d8b63508b90c2f1a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f79cdb1-02bf-42ef-80f0-f77470da3d35/32136118520.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_3a18bf76abb3438fbe6ca9f1f2425817.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_74fd7ff2c4e34089a03b4397d6d74639.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_d1b0ef851ccc43aaae6b7f1d79a5dfb4.pdf?index=trueIn PDF document text
    • http://gavawekib.myartsonline.com/24946126494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524002a2-f982-4594-a39f-4fc95993c0ac/managing_complex_change_model_lippitt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315eeeeb-0c50-40b3-ac45-a392dd07e65b/how_to_draw_abstract_art_for_beginners.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_off00014001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14001 5184 bytes
SHA-256: 50ff3df5340f4be27c71452e967dfd2bf356cb5c84017bd0d4777a24ab298992
font_01_sfnt_off0001518e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518E 12124 bytes
SHA-256: 1e7c543f469980bc32f2a6581e169664becbbf24bac9dbd1f7250a2f82552c42

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