Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e840ec7802cc9f…

MALICIOUS

PDF

81.3 KB Created: 2021-04-02 02:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6276fdb5876efb707254853840048bee SHA-1: c003693163e29bd7278e4373db7f08b4af81903f SHA-256: d5e840ec7802cc9fd20d079f9de761ba6b3509df40e54663f3299bd9055469c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or domains associated with link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=bureaucracy+management+theory+pdf PDF link annotation
    • http://nemosixumeki.mypressonline.com/98453267736.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/wBOdhcu/38628643703.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/cMgjEuU/fire_and_water_richland.pdfIn PDF document text
    • http://birixuxewazotaz.mywebcommunity.org/apache_cassandra_documentation.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/Sjcgfjb/gogojutukob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/34fcd01d-fd20-4677-af29-87588fd8ca4b/best_sat_book_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f64ec8-5e33-4d2c-8580-4b8c4c443947/the_game_changers_fact_check_reddit.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_27c8aef701b64787b06541a46cc51c74.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_31765244a9e74ea385a917e5edbf6256.pdf?index=trueIn PDF document text
    • http://pufawalaxovosi.epizy.com/what_coffee_pods_are_compatible_with_nespresso_vertuoplus.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/25766343420.pdfIn PDF document text
    • http://dopovis.myartsonline.com/romeo_juliet_quotes_leonardo_dicaprio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39638599-110f-411c-bd74-8b31188970b4/kikizopofogenazekuf.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_91a30fa0ddbd4457808df219607f4940.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_3e602f1687824d42890cfcb3e17e1310.pdf?index=trueIn PDF document text
    • http://dupofax.rf.gd/after_we_collided_book_overview.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_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 5344 bytes
SHA-256: 84def5a8b363ad1867f10028c8887123d84b1e06043e143f64de3ec98844afc5
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10544 bytes
SHA-256: 5160eb1af91b03a7e679d66bf9bf99bc33de630abe213b453b4a232f67235ecf
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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