Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b38509bc65bcbd3…

MALICIOUS

PDF

71.1 KB Created: 2021-03-25 04:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6b31ae74d877054b95057a4c7223ceef SHA-1: 8a36b7c17664804fb2cbe49da77faa9ff6e570c2 SHA-256: 4b38509bc65bcbd35a514747823ae8f6473006469b8686b73855d6ea0180d76b
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to disposable hosting and are designed to act as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=gateway+to+art+2nd+edition+pdf+free PDF link annotation
    • http://lovemecompletely.com/what_is_unity_in_art_brainly1t2cz.pdfIn PDF document text
    • http://samewejasaka.iblogger.org/gonupafusunar.pdfIn PDF document text
    • http://lefewibek.iblogger.org/country_2_step_rap_song.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/how_to_light_advent_candles_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/3ggGtBY/nostra_pro_app_referral_code.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/what_is_a_limited_service_retailer.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/dTeFihT/barcelona_running_events_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jbV5hhd/dukogipudilewetobutoxu.pdfIn PDF document text
    • http://kulefinimujaleg.iblogger.org/58709370291.pdfIn PDF document text
    • http://jorolog.22web.org/moral_meaning_yahoo_answers.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/survival_radio_frequencies.pdfIn PDF document text
    • http://natikolom.site/vufepajodixopokowodonisarjpp8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_069418ec0a3b400ebd92dffaa1a2aa76.pdf?index=trueIn PDF document text
    • http://zimaroted.rf.gd/84638621444.pdfIn PDF document text
    • http://wanedinak.epizy.com/vozowal.pdfIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_c201845ca6cc4bee9b3fe0fc2d486461.pdf?index=trueIn PDF document text
    • http://tifavamifikas.myartsonline.com/how_do_i_fix_3e_error_on_my_samsung_washer.pdfIn PDF document text
    • https://dd91dc4b-d2fe-4aab-ab17-22023aa64d5b.filesusr.com/ugd/f05b1d_0b0905d63ed74a218d5f58a969dc9cc3.pdf?index=trueIn PDF document text
    • http://vopapatadape.epizy.com/funniest_kid_test_answers_infinite_lists.pdfIn PDF document text
    • http://gejaran.epizy.com/dymo_letratag_91344_manual.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_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 5184 bytes
SHA-256: a2e72cb5ccf5c4632d2fd53a1bbfdf5b676a7d32a5b446ab3fda8c97a4c5171e
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 11344 bytes
SHA-256: d545989a11d22b6f88106cc3787dc78db3dcc27a089e9733d9ea1c9878cd2b67

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