Malicious PDF — malware analysis report

Static analysis result for SHA-256 d844cbd6c80c8425…

MALICIOUS

PDF

79.1 KB Created: 2021-05-08 03:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1304f001a7a05a120e253f2ec78fee4 SHA-1: 5f618ed03e416cb9b3a5a1a9d5f8ae6ec6f72769 SHA-256: d844cbd6c80c842543a1b1b77ba4698e6fcdd999dd9e7723cb82fe4ccaf36d04
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-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://seumenha.ru/strik?utm_term=tabla+periodica+de+los+elementos+quimicos+cuantos+son PDF link annotation
    • https://cdn.sqhk.co/gaxumisi/kgigFMS/top_up_celcom_online_cimb.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/iijiagf/94937388614.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/ottoman_empire_history_in_urdu.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/kenaxizopegubijuzuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/Xggoeja/rofinex.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/bjaRNxg/29596652934.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/amener_emmener_apporter_emporter_exercices.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/ggwFaTR/62540070148.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/detailed_anatomy_of_the_eye.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/fhd0hj4/fokised.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/04c6fc3c-918d-480b-9aa3-28f707ad03fa/converting_units_answer_key.pdfIn PDF document text
    • http://zotubune.myartsonline.com/meningoencephalitis_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78aaf39f-1013-49b0-a524-f14daec7aaf5/gaxetuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6de24f-45d8-4702-8d16-8209709b90e6/wuweriripezidi.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/bv_doshi_sangath.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0e3cf0-8148-40c3-8916-f316baa9d200/55226496541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bd47c1-8d2b-43c0-baf7-2c03ed4b1156/nowugagubimumigusoxifur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6feef950-a390-498c-aab2-d9a5b72dc488/braun_thermoscan_5_ear_thermometer_lens_filters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6beedf74-d662-48eb-894d-d507cd3a28eb/chicco_keyfit_30_infant_car_seat_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a719f3-da31-4d4d-a184-089c1ccd2e6f/easy_strawberry_smoothie_recipe_with_yogurt.pdfIn PDF document text
    • http://zonurupadul.atwebpages.com/walovilegibud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57184ea7-579d-45e4-9061-66aa54bcbe16/32468453208.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_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5436 bytes
SHA-256: e5eb5e277c48f883048e2feeab1e5ada5766be7e7e7883d5640df94e97c61d89
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 11944 bytes
SHA-256: cf116bec95840324931a97370e8e7b29cf7d70f81a6301f088738fe48af2c365

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