Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1637638f6429fb6…

MALICIOUS

PDF

74.9 KB Created: 2021-03-08 09:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9a886b758af5ad4a44923bde5e56c7c8 SHA-1: 7f31784ed469e8b37622be8b554982e087e4e30e SHA-256: f1637638f6429fb63b9e508638fee0466b6e64fb206bc3a2cbcd0e7f48d0eb23
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and appear to be part of a link farm designed to mimic search results for academic content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=lippincott+biochemistry+flashcards+pdf PDF link annotation
    • https://cdn.sqhk.co/daxerarugak/hhicjil/tudupajipetinor.pdfIn PDF document text
    • http://salonlabs.xyz/wordly_wise_3000_book_11_fourth_edition_answer_key0iwe4.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/54238673880.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/fdgiIii/51301815528.pdfIn PDF document text
    • http://brumbum3.xyz/what_does_a_full_360_meanv9e3f.pdfIn PDF document text
    • http://ebay-coupon.ru/sadiku_elements_of_electromagneticsxuc96.pdfIn PDF document text
    • http://prodive.su/can_you_shoot_5.56_in_a_223_mini_14ij5oo.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/kjern0S/exos_heroes_character_designer.pdfIn PDF document text
    • https://cdn.sqhk.co/jexumumir/e7hehMa/caponata_de_berinjela_na_panela_de_pressao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvarelo/17596083623.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/29135711535.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/bosakinetewibuxopiwerebu.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/rabelais_and_his_world_mikhail_bakhtin.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/69373225262.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/what_is_the_newest_diary_of_a_wimpy_kid_book_called.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/the_spectacular_now_full_movie_online_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/mujigiwunaxad.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/20771280615.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_d7cc776422ed4fce90a22d6cdeb0a86f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farokof/zeninifoforur.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_209073e62ccf47dfb3c7995aafe22fb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/59844500632.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_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 5580 bytes
SHA-256: e2f9dede5a12cc62a527d4e53a8d4706932a269ad3dd71be1345b3507c9708d6
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 11736 bytes
SHA-256: 8956fb116065c425bf4058c236640943cf60b579d90fa918c1ff8e46a6b7a645

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