Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7324f8c901a6e7…

MALICIOUS

PDF

75.7 KB Created: 2021-03-24 02:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c484cf8b08699c3ece7aead9edaa8a87 SHA-1: e0167b246d507e86f47958782edc94b7d94181ad SHA-256: fd7324f8c901a6e70d0e4a40f82ef5646dd5c7bcaf6bc0a7e03b9f270c06eae7
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm on disposable hosting. The embedded URLs and the document body, though heavily obfuscated, suggest an attempt to lure users to external sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=can+i+make+my+own+distilled+water+at+home In PDF document text
    • http://daravto18.ru/maze_runner_series_books17k61.pdfIn PDF document text
    • http://esclub.pro/mumanaguxavutagafudmo3k.pdfIn PDF document text
    • http://seplafond.xyz/sanford_meisner_on_acting_amazonz0mzw.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/cricut_connect_to_computer.pdfIn PDF document text
    • http://storeeuro.info/21850839205f0o93.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/21028938781.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/96386645853.pdfIn PDF document text
    • http://lovechat24.club/winchester_model_94_30_30_serial_number_searchtaght.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javamav.rf.gd/chicco_cortina_together_double_stroller_instructions.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_b33daea86115473ba5b5de2d900f2d2e.pdf?index=trueIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/badavobate.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_2f45365b1eb04e30b99209f1202c8a09.pdf?index=trueIn PDF document text
    • http://mikipifovusi.epizy.com/95711065203.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_f2451f6bd2c54a50862de5720c5e7a54.pdf?index=trueIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_2fe5a484255046969a5fe51742b8011d.pdf?index=trueIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_81927d7492fa4a9099281d584c9826ad.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_8f4a20345b5c4a1dae918c5909643579.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_532d444cf85d40c496ade03b7d48ed57.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_3fe9c5ed325944f0a5dc7dea1936118e.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_8c68c10f7e1d45938a3a44026ad83d82.pdf?index=trueIn 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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5228 bytes
SHA-256: c505bec272138af1eafa75111cc5e48dcfdcf531767321b915051aceb5f8e467
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10816 bytes
SHA-256: 4d6a049540363caadc8f5fba1532dc9d6759f94839d2f2e8b6c7eaef4f8460f6