Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb3d0df2c93a077…

MALICIOUS

PDF

74.1 KB Created: 2021-04-22 00:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2549d92ab213e9b2d1e8a98989a7c594 SHA-1: cbc8e511acad7d8622ad7f9765098aa4242eae78 SHA-256: bcb3d0df2c93a0773264a40754d29e9b70736c5749b008d4ae2bab05fe0c0994
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://leonvi.ru/strik?utm_term=arduino+uno+r3+smd+pinout', is flagged as an SEO redirector, suggesting a phishing or malware distribution lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=arduino+uno+r3+smd+pinout PDF link annotation
    • http://muxoman.mygamesonline.org/probability_density_function_exponential.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/34278545321.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/tevomenil/57364242877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c452ea-ceaa-45c0-9c18-faf5b6d40c16/mujasijudet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca78a4dc-99f6-4b41-8617-8faa26cc517f/gewuzefaganobulivaxule.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/digestion_quimica_y_mecanica.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/63994297991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4fc6ab-719f-4302-becd-179f96940cf5/sigmund_freud_books_first_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b700da96-7b3d-4bb4-bc74-745737b669b1/2012_hyundai_sonata_limited_2.0t_0-60.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/plant_cell_reports_manuscript_submission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf3d8d7-1d55-486c-bdce-07576665e04b/78571214760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746b1ffb-232a-44e5-9bff-c1471a5a57e2/oracle_12c_dbms_stats.gather_table_stats_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/50908462441.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/vubuza.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/7925786803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20071bf1-ab32-4859-945b-f4bafed0f488/time_capsule_movie_2019_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7850297-64eb-4e55-8475-ad7df7ec54c2/17242628526.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_0acfa13d736c4262bb4cf20db4c06a29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2acbe1f-b78c-49b5-9d56-9613fabf0b15/mipepowosuzutogoloxigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05acdbb5-5dad-46e8-a2f0-ea2877b6c6bc/fabosowosugizuv.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_f3dbcb7c02b94b4da0f371f1be04955c.pdf?index=trueIn 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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 5016 bytes
SHA-256: d15ced1421f55febdf32f90df9695a54b99703d34f4a2e0ae6ce2bee77686f7e
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 11508 bytes
SHA-256: 66ae9e7fb4185eabc968260a5a3e2d33d2a2d806c8cc129def4370912fbf75ab