Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b117e3d057864f1…

MALICIOUS

PDF

75.2 KB Created: 2021-03-11 00:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0df461142eca8ad7879d78400ce05fd8 SHA-1: 33732b31e4c1eb5d32d5c56ffefaa6acb8ebd781 SHA-256: 4b117e3d057864f1109f382154e95ba94535c68d413133227bb4f3839588e67c
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document's structure suggests it functions as a link farm, directing users to various PDF files hosted on disposable domains, likely as a lure for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/award?keyword=free+convert+pdf+to+doc+editable+word+document PDF link annotation
    • https://cdn.sqhk.co/gotuxixovumu/HiiezPH/80356259417.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/gjVhgBb/halloween_color_by_number_scary_pixel_art.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/roland_barthes_death_of_the_author_quote.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/jfVieBI/live_news_stream_cnn_fox.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/czDaqCb/moforofonarepo.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/98871748508.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/dwEifdC/66003099345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewawisu.onlinewebshop.net/the_standard_insurance_dental_provider_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bd5f49-064b-4e11-ba99-cc11ddb1d1f1/what_is_a_flush_in_cribbage.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_77fc094a7f6645b8bfc246f8fbf93824.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_5560e143402741108dd42f3475b1e13a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/960845b5-432f-4351-9cf3-5e154e08a8cb/78918231612.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/15429983047.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/35826762781.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_8be1e8a6800345999d0ba874c296e6be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d628c027-be99-4a0a-964f-a60b4b8b9ba3/13719137702.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/70405257028.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_023696ef796541e2891c20293c0c2387.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/mivemofedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca59667-41c7-44d6-bf1e-ecec67cd068f/61616085685.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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 5368 bytes
SHA-256: 4dcb339bc7c231f72b947fd3def9b6e4fea5d6a1a7db1a838fab3158cd6285f4
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10184 bytes
SHA-256: 3f7db4d1d2dc7f65766a37742a5adbf951e1a62f950e052ede16ddc44c76bcce

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