Malicious PDF — malware analysis report

Static analysis result for SHA-256 72be7ec6a1b95d61…

MALICIOUS

PDF

78.1 KB Created: 2021-03-16 01:53:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41cd7f5ab5348e4e0a3a0f904c2c82e3 SHA-1: c00fe1e5f72fed696827602357cc0020fc52795c SHA-256: 72be7ec6a1b95d6188d2804ea2900815053c83d12d267a426ba1877aa111618e
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using a medical billing code as a pretext. It redirects to a suspicious URL, 'https://jottigo.ru/123?utm_term=ct+guided+omental+biopsy+cpt+code', which is likely part of a phishing campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/123?utm_term=ct+guided+omental+biopsy+cpt+code PDF link annotation
    • https://cdn.sqhk.co/wogefosa/ljjgdjc/lemubuninurabetumir.pdfIn PDF document text
    • https://cdn.sqhk.co/jodanonot/ijfC9He/congruent_figures_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/myMT9id/klondike_solitaire_one_turn_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/1ibhf6w/49994059271.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/Uhbo8gj/xoom_money_transfer_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/ahjhiL7/48031329827.pdfIn PDF document text
    • http://xawexusinuzo.22web.org/committed_home_care_timesheets.pdfIn PDF document text
    • https://cdn.sqhk.co/sijaxovada/oQ2EV9P/82209392284.pdfIn PDF document text
    • http://zumigiguba.22web.org/89135993863.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/puretulenuza/metformin_hcl_er_500_mg_tablet.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/51485296232.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/antiphonal_performance_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/gigivomifalavikomebukom.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/nejufajagivezisog.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/49945528173.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/33632391311.pdfIn PDF document text
    • http://nitesegu.epizy.com/acceptance_criteria_template_excel.pdfIn PDF document text
    • http://nerepigov.rf.gd/naruto_shippuden_rpg_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/chicago_pd_episode_guide_tv._com.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/44944709154.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/3d_organon_vr_anatomy_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 5444 bytes
SHA-256: 6980ef2601d0d9825bd058536cedbb555236229301774c2d552a363be9ff0fcb
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10596 bytes
SHA-256: c1d3da6d36c7e87d517e99b2c2141f27e10cbbcec1a679a3c18113dab4d821a1

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