Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcfbc7fd6b00906…

MALICIOUS

PDF

76.7 KB Created: 2021-05-03 03:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6b47746dfea7f1edfc4479230c3b27a8 SHA-1: 750e424a7237b8bcf925e6fb6ecef581d2a3a5f4 SHA-256: ddcfbc7fd6b00906fec56953db17459f8479be94792fd7987076eea70ac8783c
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing. The document body, though obfuscated, suggests a lure related to 'surface area of cuboid tes ppt' to entice users to click the malicious link.

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://soxebez.ru/strik?utm_term=surface+area+of+cuboid+tes+ppt PDF link annotation
    • http://muxubax.22web.org/digital_electronics_book_by_bakshi_free_download.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/how_to_get_into_the_desert_links_awakening.pdfIn PDF document text
    • http://sezutupinamizan.22web.org/conveyor_belt_mini_project.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/935bb74f.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/kaboberalanugenezivonubir.pdfIn PDF document text
    • http://gopilorujisuse.iblogger.org/badlapur_movie_free_300mb.pdfIn PDF document text
    • http://solimurelorobiv.iblogger.org/camera_capture_android.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/6630763.pdfIn PDF document text
    • https://rusudunan.weebly.com/uploads/1/3/2/6/132681855/guwefat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfdf73e-3a76-45f8-87e0-b350bc1704b7/which_of_the_following_is_a_topic_studied_in_macroeconomics_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/gijotiwatowoxerukogu.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/how_to_drain_bosch_silence_plus_44_dba.pdfIn PDF document text
    • http://xalilitu.epizy.com/3512789119.pdfIn PDF document text
    • http://ziriboxemo.epizy.com/10913854784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e1757e-38e3-4623-b166-f873f65a1100/cuento_el_hijo_de_horacio_quiroga_preguntas_y_respuestas.pdfIn PDF document text
    • http://gelisufaw.rf.gd/47228627561.pdfIn PDF document text
    • http://vozonagorelomur.epizy.com/acer_laptop_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/86686129568.pdfIn PDF document text
    • http://pugazapuxijal.myartsonline.com/additional_mathematics_pure_and_applied.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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 5360 bytes
SHA-256: 0641c8e33cdd778608f3eee5622275e012a524961aeb13f8f1fba38242127afd
font_01_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 10288 bytes
SHA-256: e930331383fc80909285fced8cb21e2f05341d80f9b616e49711b4baf43c8814

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