Malicious PDF — malware analysis report

Static analysis result for SHA-256 99218be65aef91b3…

MALICIOUS

PDF

74.2 KB Created: 2021-03-11 17:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ae6866395724aad28303991d7e7250bc SHA-1: f13889a19e0805b49982297921fd5a52851cc356 SHA-256: 99218be65aef91b302dfad60084efa1c2060f1c4d11aaa38b7ca305f3f064a5e
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=sopranissimo+saxophone+price'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://yafferge.ru/wix?keyword=sopranissimo+saxophone+price In PDF document text
    • http://zoxodur.sportsontheweb.net/kopowemegizanixizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5fe36dd255d16.pdfIn PDF document text
    • http://tdsevsvet.ru/free_stuff_to_do_near_me_tomorrowdydks.pdfIn PDF document text
    • http://thecabinets.xyz/no_epileptiform_abnormalities64qej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5ff1bd90decc3.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/67818696968.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/dewasojujolaki-xawok-gaxusok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_60468196a5889.pdfIn PDF document text
    • http://frankiearvelo.com/dark_souls_1_wiki_boss_weapons_rankedu7r3i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_601b5c6ca0d4c.pdfIn PDF document text
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/belulilebawirapi.pdfIn PDF document text
    • http://garant-ritual.online/livro_de_biologia_1_ano_ensino_medioisxob.pdfIn PDF document text
    • http://easterthjg.com/daedric_armor_eso9g7k6.pdfIn PDF document text
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/manegopejejas_javopaf_lebokopifof_mureporizavul.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/waxifunobuzodojosulitetig.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/vokatamofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_ab074a11cde945499dfa032a8fb4e260.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7af74c-1474-406b-b895-c26e999a8169/41109344539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c48d5d-8947-447d-b2ce-89d53963f09c/22565409994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56eeabdd-1445-4363-aafc-f7ad81aad94a/disney_california_adventure_park_map_2001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba156307-68fc-4dfe-825f-9f9df284ff89/tisexopukofidilubite.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_828943007e624cd9a8948abe6472d5cb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 5312 bytes
SHA-256: a54aa9bbda8c013a8dc4c7464b73541316a5305e8ec7da9a8c3ce05742cd1e9a
font_01_sfnt_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 10560 bytes
SHA-256: 5a5aeff8314deffe0eb050121f65fa70f21db20778ce632a47638a32d6f71b2e
font_02_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832

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