Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dda53444b6b9f5e…

MALICIOUS

PDF

94.7 KB Created: 2021-04-26 04:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 10b6c03ca6505a55e8566edfefa16bef SHA-1: d784072b4afeb5d63f316764d2bd2f938515f2d3 SHA-256: 2dda53444b6b9f5ebe1d8149f8b178a5c7f49daafe09157502123470d67ddc64
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://xezojetit.ru/strik?utm_term=best+free+nlt+bible+app+for+android PDF link annotation
    • http://ketousa.site/south_carolina_driving_permit_practice_testefqg9.pdfIn PDF document text
    • http://reliables.ru/android_obd2_scannero3x93.pdfIn PDF document text
    • https://jivexirod.weebly.com/uploads/1/3/4/7/134707467/wasivoxudemag.pdfIn PDF document text
    • http://melofuwi.getenjoyment.net/69817792159.pdfIn PDF document text
    • http://numulul.mygamesonline.org/27106830889.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/9329670.pdfIn PDF document text
    • http://stankoff.org/vbspu_examination_form_datem83o0.pdfIn PDF document text
    • http://cyberlife.store/xakimexamc7t0r.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/32982101751.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/guvuzujamasimiselu.pdfIn PDF document text
    • http://psylath.com/355463433231frgf.pdfIn PDF document text
    • http://waralolojogeta.sportsontheweb.net/neuralgia_pos_herpetica_tratamento.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xefavab.rf.gd/fipez.pdfIn PDF document text
    • http://gudukiderunusu.myartsonline.com/acres_of_diamonds_conwell.pdfIn PDF document text
    • http://zepogofeto.epizy.com/17845460841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20aa5727-d98e-437b-a3a8-c72851acf46c/echo_gt_225_not_starting.pdfIn PDF document text
    • http://kaforezut.epizy.com/rekiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228bfa5c-99f4-4d0d-a136-4dc6b2346478/sandisk_sansa_clip_sport_8gb_review.pdfIn PDF document text
    • http://wifejijedop.rf.gd/what_to_do_if_roku_remote_doesnt_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/916bb129-39d1-4fe4-a9a7-910b71f76f04/missing_angles_in_triangles_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cce9518-037b-4df6-8ed1-8fa63749450e/whats_the_difference_between_dyson_small_ball_and_big_ball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e945df4c-ba5b-4d63-8dcb-b5dc3595cc5a/veveweretonowit.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/bar_brothers_workout_program.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 12180 bytes
SHA-256: b85399a5c358e09a69d9b8f12edc44e85b63f40b81d80d728204c01b04208f77
font_01_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 5012 bytes
SHA-256: 8672b4b38b4a3036107148964352d0e87376ef9f1f99db61f675851dbbc26047
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 11700 bytes
SHA-256: 508f33ff5fdd07e3182ae6c0b4bef9982e637e8b8b6a988f4d5e0e6246e1e7f8
font_03_sfnt_off00015ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f