Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a856e484756859b…

MALICIOUS

PDF

90.0 KB Created: 2021-01-30 23:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aec83569d520f7694757620f31206cba SHA-1: 5456f43c1eb6ff30054654d647a15ec2ee6847cc SHA-256: 9a856e484756859b39a0229e548c549e2b3f08a4b0e2594e9842486a57238f1e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'trafffe.ru' which is associated with a lure for downloading an "apk" file. The document body, though heavily obfuscated, contains text related to the "v fly mod apk download" lure, suggesting the primary purpose is to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the presence of multiple external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

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
  • 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://trafffe.ru/wb?keyword=v%20fly%20mod%20apk%20download%20without%20watermark PDF link annotation
    • https://noxazevoda.weebly.com/uploads/1/3/5/3/135348256/7bd23a288.pdfIn PDF document text
    • https://zodukoweferu.weebly.com/uploads/1/3/1/0/131069906/f44b1.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/wepal-gutirun-pagumowuvipew-zomilesejabogob.pdfIn PDF document text
    • http://jijufik.22web.org/activity_android_name.pdfIn PDF document text
    • http://fojozefamofu.22web.org/90504027819.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/tufegite_fegulitob_xuxosilulixokum_salifuxole.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/kinavazamulujejokavameru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupujipa.epizy.com/who_report_on_food_fortification_with_micronutrients.pdfIn PDF document text
    • http://zinezalidoratov.rf.gd/inverse_trig_functions_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/angular_filter_array_in_template.pdfIn PDF document text
    • http://vuwepowav.epizy.com/blank_tee_shirt_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/jamanununobaxejululaviw.pdfIn PDF document text
    • http://xetulugesoboko.epizy.com/fapuvomufute.pdfIn PDF document text
    • http://kizofenumuvuma.epizy.com/reportage_grand_banditisme_france.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/kirin_holdings_annual_report_2018.pdfIn PDF document text
    • http://povuputuk.epizy.com/possessive_adjectives_exercises_beginner.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/android_java_callback_example.pdfIn PDF document text
    • http://xawavejemefo.epizy.com/australia_post_tracking_format.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 5324 bytes
SHA-256: 9222482ca07cc63a962842237cf94dc3623e149922f8a22515fa22842f2af129
font_02_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 4128 bytes
SHA-256: e5964e708367ed8461d06e3d328a05854e71fcd0c659d3b8d47328cccb58f0d3
font_03_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10828 bytes
SHA-256: 4d7e13dec659e45e852942677bf90e3c3f2ade7986238f67d60a12fc1fb943ea
font_04_sfnt_off00014337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14337 16444 bytes
SHA-256: 56e2ed3837c681c5e1308e018870150655e9ad64e922264e7eb4be98f5e3420d