Malicious PDF — malware analysis report

Static analysis result for SHA-256 23784b1edcc346ca…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 11:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 43586933782b2e5bf0eb5c49454cf21e SHA-1: d601ad17c9af36a7b07cc73f9c2c0ad0986ab40c SHA-256: 23784b1edcc346ca93a043f65fb1bbf9439029fbcafdcfff273a55b1c915944a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though partially garbled, contains text suggesting a lure for downloading 'pdf acrobat reader download windows 7', which is likely a pretext for delivering malware. The presence of numerous external URIs, many pointing to disposable hosting, further supports a phishing or malware distribution scheme.

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://jumiwimov.ru/award?keyword=pdf+acrobat+reader+download+windows+7 PDF link annotation
    • https://cdn.sqhk.co/danopefasuf/jBiihhj/asus_zenpad_3s_10_aggiornamento_android_8.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/38314531645.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/past_modals_of_possibility_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/id6iiij/planet_of_the_apes_2001_ari.pdfIn PDF document text
    • http://zovunegem.22web.org/benchmarking_study.pdfIn PDF document text
    • http://siduwukalupi.22web.org/basic_calculus_book_grade_11.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/entomopathogenic_fungi_as_biological_control_agents.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/dc5d20c5-539d-44fc-838e-0a6f1a3b27b1/67377086585.pdfIn PDF document text
    • http://wififeju.atwebpages.com/hematopoiesis_indonesia.pdfIn PDF document text
    • http://wamodaf.epizy.com/mivesavovidubulurufo.pdfIn PDF document text
    • http://mojefujal.rf.gd/43050687756.pdfIn PDF document text
    • http://pixafur.atwebpages.com/digestive_system_diseases_and_disorders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7c09c5-2c8a-4ec2-ac50-1c104f03ebec/honda_eu7000is_generator_best_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9aa540-4435-4e36-88a0-746ef7e695c5/93384715548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e5702f-3da4-4c61-96e7-fa4d8b471a73/how_much_does_a_00_buck_pellet_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202775b8-682f-4d34-b922-89644ff85d76/super_mario_bros_2_switch_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4913f852-6b3f-465e-bd87-297230c7fb93/mudepojufogapal.pdfIn PDF document text
    • http://kexomun.myartsonline.com/42292619662.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/suzuki_quadrunner_250_parts_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280e386b-0006-4206-aea4-9d90e59af62e/tabof.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 5328 bytes
SHA-256: 16d7644817de6985a4cfd1428bd888a78132f65865785025e2447de114b3fd5f
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 10628 bytes
SHA-256: c6dc4cbe30c543911bc7815e63a7f4579c885d9a18abd465c573e46418664472

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