Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a6cfaf53c2df28…

MALICIOUS

PDF

79.9 KB Created: 2021-03-05 03:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 79d4437f1a5e94a1ad769552123e2f09 SHA-1: e43df5a48fc6fee7738a0225fff66c5ac019813d SHA-256: 76a6cfaf53c2df28f5c3bcdee55645c2004beb1db943e1fde5d90e8d967dd29f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=how+to+find+the+angles+of+rhombus PDF link annotation
    • http://leafester.online/how_to_identify_dipole_dipolekaybm.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/what_are_reasons_to_stay_alive.pdfIn PDF document text
    • http://flathead.us/mikajtoeqj.pdfIn PDF document text
    • http://tinewipikawulu.iblogger.org/firearms_licence_safety_test_answers.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/5437298767.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/9344684.pdfIn PDF document text
    • http://formblckr1.xyz/xuzodajajasumopewzg33.pdfIn PDF document text
    • http://alfa-quest.ru/ib_spanish_ab_initio_textbooksrtx0.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/runudamorapofo_rawumopenotuxi_gukopogutiku.pdfIn PDF document text
    • http://momarivido.mypressonline.com/piriformis_syndrome_stretches_and_exercises.pdfIn PDF document text
    • http://medtechnika1.ru/58061920562ozr5f.pdfIn PDF document text
    • http://jamidufabe.iblogger.org/awesome_oscillator_strategy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resifidivef.epizy.com/toluzerotenesak.pdfIn PDF document text
    • http://tovajukoxeboder.epizy.com/dlink_router_dir_615_configuration.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/plan_y_programas_2011_geografia_secundaria.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_6f38bc5ff8ef4de78665c78e923d704d.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_7e1136ae72bd40c1bb4acd839a0382d6.pdf?index=trueIn PDF document text
    • http://wipevamejajevim.rf.gd/app_store_android_file_transfer.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_3c595ab4f708444e9df0c6c233ff8d11.pdf?index=trueIn PDF document text
    • http://sakogabutal.onlinewebshop.net/bujolaf.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_18dca5a3822f4408aa18df3a2fe8356c.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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 5512 bytes
SHA-256: 545a03c7bf5e4ec5e0205e0e815a5861877dd396e347b249f850c437553f6f64
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 11148 bytes
SHA-256: 6ed79744df73525012ae4e688500993cfab837e44f39df81a065490f934ecd42
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1

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