Malicious PDF — malware analysis report

Static analysis result for SHA-256 56255bb0c30621ea…

MALICIOUS

PDF

82.5 KB Created: 2021-02-24 11:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e808fe277228ba58f083b5d5f7d36878 SHA-1: c0945614b4d7296bc71536ccb93f7c640d3b8146 SHA-256: 56255bb0c30621ea6a0dd410627927a4aa67d154e8b56a6d4209aaa387165b02
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=is+there+a+music+note+emoji PDF link annotation
    • http://extrameets.fun/how_long_does_a_100_percent_battery_lastmsr1v.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/dqROjdw/promo_game_free_fire_diamond.pdfIn PDF document text
    • https://cdn.sqhk.co/rewaloxuruvu/Lhahghc/87135194288.pdfIn PDF document text
    • http://geesecam.com/numurekoduvojwwbmg.pdfIn PDF document text
    • http://avit0.pro/xifikugncudx.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/sgj0Xja/3d_car_design_software_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fc978581847a.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/jfwgcig/describe_the_civil_war_in_russia.pdfIn PDF document text
    • http://mazanatur.space/82842246237pl4hj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5fec027451692.pdfIn PDF document text
    • http://tipaxoj.66ghz.com/4890636971.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/GxyDVha/durujivimomowogulubipor.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/vavale/itr_1_form_assessment_year_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/as_metal_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/livre_de_conjugaison_anglais_franais.pdfIn PDF document text
    • http://momomalolo.epizy.com/nosql_database_design_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/nunatirusigekuvudox.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/personality_disorder_treatment_guidelines.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_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 3656 bytes
SHA-256: 4e2f52c6d36cb6af3724feb5ba833921d9737ed6adfba5a9afd4e94dc502a14a
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 5020 bytes
SHA-256: de11f6c4bce66662ec224fdc3f54dd0aeff7bef76227cf15b65bbcf2497eaafd
font_02_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 11188 bytes
SHA-256: a001ef4c2c99227abe90a716c32ab25ade75c5a887ae41885ad2374a78f8056a

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