Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfd6ff2b31fa0e9…

MALICIOUS

PDF

68.1 KB Created: 2021-03-14 02:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 338003ff93c991e9ff265548b16c25be SHA-1: f50088176a582914e0e08f118eff5b84e5b921a6 SHA-256: 7bfd6ff2b31fa0e9f0e8e71e9a754c8ba73b5f44bf4786b84f2c9f177916c888
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to an 'osmosis and tonicity worksheet'. The presence of external URIs and the overall structure strongly indicate an attempt to redirect the user to malicious content.

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://druttle.ru/wix?keyword=osmosis+and+tonicity+worksheet PDF link annotation
    • http://sanatoriy-izumrudny.ru/make_simple_sentence_on_monstrouswyibz.pdfIn PDF document text
    • http://fineagencyy.com/89758586830ujnnq.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/gjwhaia/74568475659.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/zaxoruwuxenozunedatovawem.pdfIn PDF document text
    • http://fuzirirofo.iblogger.org/pyramid_principle.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/dVRhdhh/63268218953.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/EgcnQmz/revised_total_coliform_rule_sampling_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/jf0iaJr/radio_uk_top_40_online.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/Zmgggif/kewejefovi.pdfIn PDF document text
    • http://gitipakivo.iblogger.org/ignition_timing_explained.pdfIn PDF document text
    • http://metaleagle.ru/doro_8030_mobile_phone_coverssblzw.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/jeD0hf8/pukuxamewedilaxilip.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/QlPjjci/pevavadefepadezis.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/0ghiHeu/kojekerilepem.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/que_es_psicologia_organizacional.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/fexuror/rutijakazovuloba.pdfIn PDF document text
    • http://relumewamamit.rf.gd/zimaladisofudaravim.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/juladirazenufazeviruva.pdfIn PDF document text
    • http://daxupote.epizy.com/motorola_talkabout_radios_review.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/asterisk_guide_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/26943159918.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/simple_math_problems_with_answers.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_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 5432 bytes
SHA-256: d408aa028f616a85fe3a69b1b95612627f44cc4059a027b72d993ff7de314da5
font_01_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 10304 bytes
SHA-256: 34c5fb6db5e3aaa6fa52d49e4297a51f13b87ea2c0f10f85496046735d137831

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