Malicious PDF — malware analysis report

Static analysis result for SHA-256 db860b6aaf7f7253…

MALICIOUS

PDF

81.2 KB Created: 2021-04-02 07:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1496c5a9f35fb643f4b243e25fe15fcc SHA-1: e40a726a024276a1fe6c03885bf9dba44fbfc926 SHA-256: db860b6aaf7f725395af22d06a31012b2e89bc1f90bb0490d713d9752de00db9
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, as malicious and phishing-related. It contains an external URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=cronicas+de+una+muerte+anunciada+libro+completo+pdf+gratis PDF link annotation
    • https://dubuzimonovox.weebly.com/uploads/1/3/4/3/134347386/7409322.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/heEhfhj/58101164232.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/ihhaTvM/luzuxumadetajepapejelot.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/tolowipovuke.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/141c65a4ac.pdfIn PDF document text
    • https://danizejoj.weebly.com/uploads/1/3/5/9/135990884/vezigidekopepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_a4562fa71cd84cc69e0e2bae3d539571.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/balance_and_unbalance_force_worksheets.pdfIn PDF document text
    • http://gijaguvid.rf.gd/edgar_schein_organizational_culture_and_leadership_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/how_to_load_paper_into_a_smith_corona_typewriter.pdfIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_bc1b3b1a95424830929bc0e1a07f8683.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/what_is_feminist_sociological_theory.pdfIn PDF document text
    • http://badunedotefewep.rf.gd/highlights_hidden_pictures_answers_january_2018.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_40ea10c7e99f402899e95d24c31b2e32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f6fd60-7676-4616-9329-39b5f0bdd6e8/74325846769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1488e30-64b3-49b2-b524-f661a3a31e60/xbox_one_elite_controller_custom_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2c5733-2809-48be-a624-e974b818afdb/selijose.pdfIn PDF document text
    • http://jewedib.epizy.com/19682199967.pdfIn PDF document text
    • https://c9ecad83-e70d-4e71-84d8-0086c45344aa.filesusr.com/ugd/01a317_2e47852e0f5746d796ec71f635a329b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/ridudof.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/jsreport_chromium_revision_is_not_ed.pdfIn PDF document text
    • http://xubudexev.epizy.com/thermometer_chart_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8c6423-9eff-4517-ac1e-9875279d42fe/sezaro.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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 2828 bytes
SHA-256: ec0617e7d4b767a4f38c4993bdaaecdad4a8b4ca688b321d2bd370a6bc92076d
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 5520 bytes
SHA-256: 35d4966f2609e1517cf7806cb14aea095b6b926df5fe06ba0a4a228ae34869d1
font_02_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 12212 bytes
SHA-256: ade31ad3334f53f7179f945fdcf2b99c0f7112143b572e433c7628fd34d4fcec