Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e638933f1215c38…

MALICIOUS

PDF

81.0 KB Created: 2021-05-29 02:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 55c8c075394eb3cf5e6a8515157cd432 SHA-1: 4faba069b94fff8e381f6a51b8b475a1907743fe SHA-256: 5e638933f1215c382c1c541405edf883d7e8a4a7a3c5400ba6054ff48dd7f438
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, https://jumiwimov.ru/strik?utm_term=how+to+stop+my+android+tv+box+from+buffering, is likely part of this scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=how+to+stop+my+android+tv+box+from+buffering PDF link annotation
    • https://ligenoleka.weebly.com/uploads/1/3/4/4/134496601/a908f3926.pdfIn PDF document text
    • https://rojilijeliw.weebly.com/uploads/1/3/1/4/131409822/fesibudaku-gupinux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_6026568bd94e5.pdfIn PDF document text
    • https://fugazuxelodurip.weebly.com/uploads/1/3/4/6/134639195/dufimaka.pdfIn PDF document text
    • https://luvabuzizav.weebly.com/uploads/1/3/5/2/135294148/vamofilekuge-nukobifotezuziw-gizipunebuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_6005ebc972335.pdfIn PDF document text
    • https://vuwonogi.weebly.com/uploads/1/3/5/3/135300132/dffb12ed367ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_6056c733ab904.pdfIn PDF document text
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/xixodetivivune-reboso-pufetopotivopow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_5fd7d54cf234e.pdfIn PDF document text
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/6641548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_60266a02f4233.pdfIn PDF document text
    • https://vekazapez.weebly.com/uploads/1/3/4/6/134601327/lojoxizoxek.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/17c2bebe-c2ab-4731-bc12-249f611a275e/what_does_a_d_stand_for_in_dog_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717675f1-c873-4d63-85d9-c7ee32c93b53/book_of_exalted_deeds_3.5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0827814-97a5-4e94-a817-fdd056745d8a/how_to_install_brake_buddy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf82642-94ee-4cef-a455-8b7db7491c13/bearing_maths_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3719c3-4ac4-49de-b52b-98f2fee79b37/manual_de_organizacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e9353f-ffb8-4ae3-8165-2ffc6ee02596/lost_in_the_sea_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd077772-9849-436c-a261-561c78a5ce5f/how_to_do_outline_drawings_on_procreate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03495089-67fe-4522-b88c-e842ad51d574/bedobuviduvonuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd4f73d-2835-44b8-8e9b-a74e75290cf3/pakemidibowisetekazuder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48523ee-1de2-4fa4-8ddd-aca38ed02bb0/40238554099.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_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 5752 bytes
SHA-256: 617e7f679f700126c4318ef95df563c6996a3f9188bb004bb7d4d0a299a20e4d
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 11036 bytes
SHA-256: e72d9f74a6d6b8328ae69cea75cae98ed3c92ebe7c4048d76ba074b169a9c586

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