Malicious PDF — malware analysis report

Static analysis result for SHA-256 a976bb3ff7ef9e56…

MALICIOUS

PDF

87.7 KB Created: 2021-03-22 12:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f2d706dd9a59edd0ade2db250f35c5a5 SHA-1: 6338b01bf48fe363bb1dcd8f369758c805e17c08 SHA-256: a976bb3ff7ef9e562feb9c1413a9e564f405aee819dfdef9f665510e21bc30c8
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Fitbit charge 2 reset instructions', indicating a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://soxebez.ru/aws?utm_term=fitbit+charge+2+reset+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390092/normal_60536aa7d2025.pdfIn PDF document text
    • http://spain50off.info/kittens_first_full_moon_sequencingz1508.pdfIn PDF document text
    • http://copyrightnotices-form.com/introduction_to_econometrics_updated_3rd_editionei1tj.pdfIn PDF document text
    • http://crystal-light33.ru/bank_of_america_address_for_wire_transfer_internationalwv0yn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6048e841ec0d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fc8bf4ccac10.pdfIn PDF document text
    • http://naturfresh.space/brothers_in_arms_3_apk_data_offlinefq2an.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_6050031e6213d.pdfIn PDF document text
    • http://skidki-day.store/general_knowledge_science_quiz_with_answersrbiyb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_60334a96b8c1e.pdfIn PDF document text
    • http://esclub.pro/how_to_adjust_sears_garage_door_openerpzbbm.pdfIn PDF document text
    • http://gmetry.online/dd_dragonborn_fighter_namescutxc.pdfIn PDF document text
    • http://usechambre.xyz/investment_property_portfolio_spreadsheet65hb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_6021aadf2b23b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fdd68375c211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369343/normal_6002deb3aafb7.pdfIn PDF document text
    • http://italylife.pro/22172927475ukhgp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_60136417e7034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6048eaa94a13a.pdfIn PDF document text
    • http://reduslimitalia.site/rawewisopisemenojeki2jjk8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f54169a-0fa4-4079-a2a7-96524daf3dc9/highest_aids_rate_in_the_us_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc2c3da-f46f-45be-b5e3-8e991cf9c2b8/74642223181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3f6afe-5356-4c2c-b7b2-6979946e170e/63035821651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f9b475-70c7-463c-a971-ef6d7a083e9b/pedagogy_of_the_oppressed_citation_1970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe7807d-571a-4b43-8f7b-7d6f10ef146f/life_fitness_elliptical_x3_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb95c3df-7a9a-484e-a7f1-26386ec22b04/webasto_diesel_heater_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5970c9-ad8c-4533-a782-24e0f6aa4d75/91397056532.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 6424 bytes
SHA-256: 4455747fda9ac97410526ac3fee3ca643cc61cb592146befb7df79af2604d95b
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 5256 bytes
SHA-256: 680cfdfd6351497c53a459a26b76b718cb4b6334fa3145e87804a863459650f6
font_02_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 11000 bytes
SHA-256: d1108d154f475dc290f36240b9457ab0b25c2511de2b97b947cd27d7764a955b
font_03_sfnt_off00013b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B25 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f