Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4b0e284143dca3…

MALICIOUS

PDF

93.0 KB Created: 2021-03-17 15:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7d9612ab00283910253a77a0b6f0bce0 SHA-1: 0e9effdc046932fffd8b953a9359e1da0091c89b SHA-256: aa4b0e284143dca3a0ec907be8d7eeb79b3593563854f11a8eaf928c6d1eaf44
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one specifically designed to mimic a search result for a book, likely serving as a lure to a phishing or malware distribution site. The PDF structure and embedded content suggest it's part of a phishing campaign aiming to trick users into visiting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/wix?keyword=patrick+o%2527brian+master+and+commander+pdf PDF link annotation
    • http://dostafood.xyz/2882321527110ltg.pdfIn PDF document text
    • http://dompodklyuch.com/introducing_interval_notation_worksheet_answersplll2.pdfIn PDF document text
    • http://zabavnyi-slon.ru/evenflo_symphony_dlx_car_seat_installationdrc21.pdfIn PDF document text
    • http://subumobo.22web.org/28859702596.pdfIn PDF document text
    • http://supermagazforsale1.xyz/weverit3co95.pdfIn PDF document text
    • http://fortuneo-enligne.com/67106617366wyop1.pdfIn PDF document text
    • http://ketotreno.buzz/deschutes_river_fishing_guide67njl.pdfIn PDF document text
    • http://zootime.store/boss_riot_r1100m_specsld72t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nikuzemadol.rf.gd/carefree_path_of_dreams_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/shipping_labels_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde0f9fa-edc2-42b8-be48-d5231093b05e/87519295767.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_3a7780c69fe84940874f94c2e0393837.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/50428614840.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_0a8f70c86e734f03b6158cfeac0b3c10.pdf?index=trueIn PDF document text
    • http://nofevenajome.rf.gd/how_to_learn_app_development_quora.pdfIn PDF document text
    • http://zusozokag.epizy.com/acceptance_and_commitment_therapy_100_key_points_and_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/d._p._o_full_form_in_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f3745c-6088-4209-80f0-fef01bd2eb2c/17608155313.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_f7a6ae9191044bbea552e66fa88cf4c1.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_52d9895bccfd425e9d34464358e5e458.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_09ca1d3850b0403cb603d463b92c42c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazatuv/15591003846.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_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 5508 bytes
SHA-256: 478aa2fd9740acb7983db05d9e1cb69335c95a94287770fb838181ad1218f882
font_01_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 11224 bytes
SHA-256: 2c4c1c4745b9079275eb668fab9e4bc2a77f7e51333a235efe1358c479805454

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