Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2a99db0b466495…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 19:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d6e23dad299141da4e9e18009b2ff42 SHA-1: 6818f2ec7eb39969e310cfb884849523aa82d2f2 SHA-256: cd2a99db0b466495316c2dbabdfeb08bd4868591b95a0c556083591cee5e3fc8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/award?keyword=causes+of+depression+pdf PDF link annotation
    • http://kunepuvobimamin.medianewsonline.com/boost_c_library_book.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/a821e0.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/how_to_read_the_air_book_review.pdfIn PDF document text
    • https://babidunilatejob.weebly.com/uploads/1/3/4/2/134266015/vogage.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/jegenorubovibalidix.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/benanibulasozutolodiv.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/6231196.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/rovanux.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/gotenukevepunin/autocad_2013_free_32_bit_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5779825a-d342-4bfb-a9d6-fdf746c198ac/experience_and_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9630954e-bd19-4ced-9544-e3fb1749a8df/complete_plc_programming_course_download_free.pdfIn PDF document text
    • http://purezaviwof.myartsonline.com/nuclear_isomerism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ab6afa-8a50-4597-8721-cb4033547946/21641416614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6797c1ae-5912-4572-a835-e4926b9c9ad4/practice_sat_test_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57ef957-5bd7-4f34-a5bc-e8423b68ef31/fanubuzobu.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/instagram_stories_template_after_effects_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/kopafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4f2a93-c864-4d12-81aa-b3143517c65a/1996_polaris_xplorer_400_tire_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9cd6b8-7bf9-41fa-ac77-1572ffb7d24d/20438455905.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/jafuderonunedemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578ecc65-440e-4794-9a84-7a4491f00c48/perspective_projection_in_engineering_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ca7502-bfa4-493d-a765-99c92c1ee085/69194068783.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_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 4908 bytes
SHA-256: 68d18eb9a22933e57b333760151206a02e1b8b70fddb2abe3b00b49e2ba1eb5d
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10988 bytes
SHA-256: ae5496ba5102ba5d719dc433489f22c5ec9ed241664521e82bed95fb59af7368