Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fc35072992154f…

MALICIOUS

PDF

68.8 KB Created: 2021-01-22 10:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7e9870129a8a5de2f053690837b491c4 SHA-1: f668c26b4a4709bbf6e7c5f2661d07ec7043d5c7 SHA-256: 67fc35072992154f4803f32c6e0c68d45dfcf0c2b6adc9e25f2beabafe142190
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, including one pointing to druttle.ru, suggesting it's part of a link farm designed to redirect users. The PDF's structure and embedded links indicate it's intended to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=printable+graphic+organizer+for+persuasive+writing PDF link annotation
    • https://site-1168088.mozfiles.com/files/1168088/responsive_email_template_for_gmail.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/13479611008.pdfIn PDF document text
    • https://site-1173313.mozfiles.com/files/1173313/2017_nfl_football_cards_complete_set.pdfIn PDF document text
    • https://site-1171133.mozfiles.com/files/1171133/fisdap_airway_and_breathing_test_answers.pdfIn PDF document text
    • https://site-1217489.mozfiles.com/files/1217489/beauty_plus_camera_apk_free.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/senitisumadelavu.pdfIn PDF document text
    • https://site-1175994.mozfiles.com/files/1175994/crazy_train_band_performance.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/environmental_law_in_south_africa.pdfIn PDF document text
    • https://site-1178504.mozfiles.com/files/1178504/telemedicine_jobs_for_doctors_in_bangladesh.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/sazixipame/floristic_regions_of_the_world_takhtajan.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/gasot.pdfIn PDF document text
    • http://vimonaker.epizy.com/95582768542.pdfIn PDF document text
    • http://nabunuwo.epizy.com/xumonume.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/wajojupabive.pdfIn PDF document text
    • http://tolimimagag.epizy.com/65923945395.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_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 5620 bytes
SHA-256: 67dec95788bc9ea1ae466a7f66da85f411cefc2184352cd493f960722c71969e
font_01_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 10128 bytes
SHA-256: b4b9f37355b35994864d093b6cb1257ecd93fa0e778c7f6e564fd21bc749d21b

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