Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b047e9e33d4861…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 22:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 30c8010bb171b67df649f421ca7525cb SHA-1: b2b8fb44d250011e7837ac04920ea3827aad7a03 SHA-256: f3b047e9e33d48619e95cc623c7500927966f6f732c58fecaf463438fe9b8d33
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/aws?utm_term=canon+lide+210+mac+driver+download PDF link annotation
    • http://evakuator-uga.ru/minonusasegutasoneejlst.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/gdhalhc/reset_sprint_drive_password.pdfIn PDF document text
    • http://net-klientov.ru/annual_report_aeon_credit_servicedt3k9.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/b0MjgSd/shadow_skate_mod_apk_android_1.pdfIn PDF document text
    • https://maruvape.weebly.com/uploads/1/3/4/8/134854924/lapasawul.pdfIn PDF document text
    • http://fb-ig-violation.com/chapter_test_a_chemical_bonds8b5hk.pdfIn PDF document text
    • https://fuselenedirila.weebly.com/uploads/1/3/4/5/134597682/vawixa-taroxazazak-doxitajexofo-berar.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/ghe6shg/geometry_crash_course.pdfIn PDF document text
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/zoxogikanumowoti.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/ihiM4ia/3d_bowling_apk_file_download_for_android.pdfIn PDF document text
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/500907.pdfIn PDF document text
    • https://gemunokixelu.weebly.com/uploads/1/3/6/0/136095878/9272297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/xijesazo.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_738727d9e5db43ddb7905dc8bb0c41f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xotomisen/34619575113.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/double_bed_size_sheets_uk.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_b78cc7f7358b41fa9eca5b40d6b62fae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b19b50-42b3-40dc-a1a4-8929b0145639/39431650296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab1df71-25d1-4acd-a800-517e9b418ba7/how_to_fill_hoover_dual_power_max.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_e18a83da4b49454e80c0189887f951ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/manitowoc_herald_times_reporter_for_the_record.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01821ce2-5860-463d-b52d-be4b231131e5/modo_de_produccion_economia_primitiva.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_b5ae0e1b49f444e0a6a589f0ce7413b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/757f4380-9465-4b0f-8faf-8a985f193b67/mesujupe.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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5292 bytes
SHA-256: 5269e49558c1155c8b4c77df719136f69ef235d32fdfa66bec8e997b94250509
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 11112 bytes
SHA-256: 949b327a6eef44a87fc771bfddab274d0a74bd72bcbcd744720986836e6c646a