Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b263408e894de5d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-21 03:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ef80c35f347a3502f3864e8a18597ee2 SHA-1: eb77f95a3db051b6409cc7238ba6610419d50f6f SHA-256: 7b263408e894de5d0a4a0889e86bc8b7cec2452d03683529d19f13e883def273
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that likely lead to malicious content or phishing pages. The presence of multiple external links and the PDF's structure suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/wix?keyword=folland+real+analysis+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366354/normal_6048ff7237ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_60563c638ca8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5ff617bfa53fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_60520f725bbc3.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/2be3f484-738e-4fb5-9f12-3b535658221a/niwurinutakofilude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a793df-9810-44fc-bcfd-176d086d86da/libro_de_calculo_integral_dgeti_resuelto_2020.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_71b697f16f8e4ef6bcc3fd7e4428e4ff.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_e966fa5a2ad34539b1f678cd658f6841.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_a952fba2d8d4452986c7023e64cd2b0f.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_ed0b37b26a6543d9bd7b1d19f03a6e34.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_b58aa03348d84766823ee838c0823b10.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_893314236b3e41649f892564cc249299.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_b8e835bbf9d34c569f143f23bfb2b85d.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_5605048450914229bb19f640a4b8ddd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/irs_hardship_guidelines_for_401k_withdrawal.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_3183f1302ccf476aad70f74876d4c35d.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_d0a8a86af8674bbf826c11678612dbaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/house_of_night_books_in_order_list.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_cef331aad1024adfa4735a3f4ca29777.pdf?index=trueIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_9c7b4e2f264e4b9881703cb0209bfdd4.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_a55bf4b674c84b40bacbdf67b6fb1e26.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 5092 bytes
SHA-256: 87e6f9c94a1587a946bd97793c1ea105ecf5463507cb02721a0df465591d3c2b
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10724 bytes
SHA-256: 3a36bfd1d0f887b5ccf5c199bf310130f1f2d3561fbaf261ff7883620fb14a50

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