Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90341515a02187c…

MALICIOUS

PDF

81.2 KB Created: 2021-06-11 04:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2ee2a082584c9f0539829576817c5e39 SHA-1: b5fa307fbdaeaead4dc141b1346c65646acaab12 SHA-256: b90341515a02187cdf7f5fbe50c2a5586f6ebd7b0bff3d39ca8f55e983d9aff0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=baidu+wifi+hotspot PDF link annotation
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/gerixixezax.pdfIn PDF document text
    • https://fodirimuf.weebly.com/uploads/1/3/4/6/134621751/fewifuxipu-berovem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_600fa9965f8c8.pdfIn PDF document text
    • https://zinebogexorebo.weebly.com/uploads/1/3/1/4/131437984/lewapafonus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ff0899dac777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_605417243f794.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/vikuzab-jubatipituwelo-fabotagizudopa-molulotilafabor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_6053af1a3d4e1.pdfIn PDF document text
    • https://kopojari.weebly.com/uploads/1/3/4/5/134585935/cff6e28eb48a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8efacb99-2ce3-4c04-a95b-f663a7bec285/monthly_budget_planner_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcb275b-796a-46ea-afa3-742458abbf68/zixokisafuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528a9db4-85e5-4727-819e-806885e4d493/8514159942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1926f14c-586b-424f-bf89-49610c90a747/microlife_error_code_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503a936d-92da-4004-a031-70cd61b02e14/matched_by_ally_condie_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f982727-a7d3-4878-8701-d679c4044b97/2003_honda_odyssey_transmission_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdfd313-640e-490e-b631-d0b08e261943/32328128837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15138c1b-9232-433e-be49-2d076eb2f393/breath_of_snow_and_ashes_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c0d96e-c7cd-4f08-93db-43e19b5e42c5/how_to_edit_a_background_into_your_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dee2554-d70e-48c7-88a0-072591ce580a/clash_of_clans_best_th5_base_layout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e76351f-0642-4915-a629-af72a666195e/q__cia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68290d17-ebf1-4a3e-b9f3-0132e45cbada/how_to_change_kali_2020_root_password.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 4800 bytes
SHA-256: 1009cabc13ce8d74a7695282367bfb2d0958df3431279b4f7d1e79cad880ea09
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 10584 bytes
SHA-256: a1c9ce74a8085ca493d10ccf03e8adbe031a82b4edd7436d9b8deb156b723d7b
font_02_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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