Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c23eb15dffc25f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-13 20:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 423b0f34f379aae953f6ac2ee4450916 SHA-1: 5acc3d2080a2b78d3c340a7b35db631904c3d79e SHA-256: 15c23eb15dffc25fcfec7aa1f2c33dafc50e3fcbb0c9618e839504be0cb25899
96 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 point to SEO-optimized PDF files, suggesting a link farm or content stuffing tactic. The primary external URI points to a suspicious domain, likely intended to host malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious lure designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://kuzutuzo.ru/award?keyword=biotecnolog%25C3%25ADa+en+la+industria+y+agricultura+pdf PDF link annotation
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/8373756.pdfIn PDF document text
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/fitolesogazo-sofigidizi-napefawigekibe.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/laxejuzivowevido.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/what_are_the_rules_for_commas.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/1616384.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/1efab1c8-09bb-4de5-bbf7-6d1becc09700/66285844498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f208e9-be82-43c4-ad2b-96d41072acb7/2142185368.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/kepubuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08976ee-eba1-4bdd-b244-f390f4149b3e/78344474865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cfde65-115f-4333-981e-cce894887c6f/23855642409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56299703-d19e-49d6-bf2a-29cb2b0a5f03/fifty_shades_of_grey_free_download_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91ce120-02a5-4577-8fd4-1cbbad773bd7/how_to_use_the_sound_card_v8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc61090-6eed-46c2-ae0c-ae8a692cc044/nuvadesumilefamolen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b529f2ef-f085-42a1-a6f2-28fecb240a10/96413270850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f94bbf-11f7-4427-ad82-1084058c5d48/simple_interest_worksheet_iprt_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6530680b-cf3d-4733-8c55-f8ab4c0ae92b/thank_you_maverick_city_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1107d7b1-1458-4f03-87ee-007b9cf11969/what_is_a_physiological_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4dbd33-ab17-4c72-a474-24b8ea3592f7/bifojavamidujekakazaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac5e17c-5e29-4436-b03a-7580dc305d17/what_does_it_mean_when_your_license_says_not_for_real_id_purposes_nj.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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5528 bytes
SHA-256: ab85cf90d019939f8bd0462483bae59442d3f32e51099e774e52efd6f74a8fd1
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 11596 bytes
SHA-256: 31062fb20e0ba5c697f47d7547c6dc371bc4e12f5037bee0b173cb2099313be1

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