Malicious PDF — malware analysis report

Static analysis result for SHA-256 045e340cf91e315a…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 08:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4e3ad6a5a4353dc31d1860c37bc48e55 SHA-1: dc7cfd8c25bbced44a682e3352a2c3cd863a4018 SHA-256: 045e340cf91e315a22cc463b8363475791e037be81096a51faf791675c1ce54b
136 Risk Score

Malware Insights

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

The PDF contains an embedded URI and an image lure that redirects to the URL https://bologen.ru/strik?utm_term=what%2527s+the+hardest+question+to+answer+reddit. This URL is flagged as a redirector for free-download phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bologen.ru/strik?utm_term=what%2527s+the+hardest+question+to+answer+reddit PDF link annotation
    • http://novonet.online/latest_call_of_duty_xbox_one_xscph0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_601a006f9c7c3.pdfIn PDF document text
    • http://flebolog24.com/garmin_vivofit_jr._3_activity_tracker_with_adjustable_buckle_band5al7d.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/lagu_blood_money_jon_bon_jovisd1kl.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/how_to_create_a_cost_comparison_chart_in_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5ff3dca4bf081.pdfIn PDF document text
    • http://prizinsta.site/77530704761cgb32.pdfIn PDF document text
    • http://devgame.design/13344961466jdy87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_6028c2624758b.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/kazivinijabot.pdfIn PDF document text
    • http://keysecret.ru/sobafajulol8mmuy.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/periodontal_gum_surgery_recovery.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/full_wave_rectifier_physics_project.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/software_architecture_in_practice_len_basse8toe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5fe48fa13c646.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/xegibotupawivif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421476/normal_5ff4171588acd.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/gazivemon/how_electronic_health_records_are_used.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/66810432273.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/70368945341.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/wogemosikatag.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/12419745015.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/likugidususoxukeso.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/formation_amlioration_continue_caen.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/lomen.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/21235579944.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/79211169508.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 5148 bytes
SHA-256: 1455174737093f2faee3333d2a267ac2249007362a6ad949189c2a5c4ea1a251
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 10944 bytes
SHA-256: 7b9092733a8c6fd911228314b905e5715aed689f919bac535b4c253f5d91137e