Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdd9fafafc6714c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 18:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cbef10f2768f0847fdb08f49e0a551ea SHA-1: 1ae0e159e38329e01affecd9b32602571e580771 SHA-256: 7cdd9fafafc6714c1551e97dda2da6a85d98a2eff456c7512962d6c00639b748
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dafemum.ru/strik?utm_term=where+to+buy+wolf+ovens PDF link annotation
    • https://cdn.sqhk.co/zoribakim/d76QicT/truc_de_grand_mere_pour_soigner_un_rhume.pdfIn PDF document text
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/e43e6cf92.pdfIn PDF document text
    • http://logivojem.22web.org/superman_1978_full_movie_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/FhehgeG/little_horse_running_fast.pdfIn PDF document text
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/189274.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/cggc9jh/z_girl_names_for_dogs.pdfIn PDF document text
    • https://xujesosa.weebly.com/uploads/1/3/6/0/136090165/josedopetaza.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/56iaVSp/34406742160.pdfIn PDF document text
    • http://zokumujanuni.iblogger.org/48783293103.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/mKjgxTU/26584703217.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/306a8ae6e468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_c09f7d2c832845b6b45ba151254dc979.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f59984f-2965-4046-b1d5-266a3846968f/tp_link_n750_manual.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_8ce181bc3bde45cd9228866c7be98ef4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/multivariate_correlation_analysis_python.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/kagazemizokirolijipire.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/free_math_coordinate_graphing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ea5f27-d316-4e6b-a99c-ea0aeb76b659/chicco_keyfit_30_car_seat_installation_without_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195d95cc-e1b1-49d9-8cf6-91cb6bbb95ac/20080356383.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_655a29a1a3c64358a4c60ddfd682f0db.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_252c4e2de3f94e14a4395234113721f7.pdf?index=trueIn PDF document text
    • http://dimazobuxijema.epizy.com/possessive_nouns_exercises_with_answers.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_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 5052 bytes
SHA-256: 5b3f22df728880835aebdb7e4d4f7e53a0de9a84fcc4636425645a9b233b586b
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 11100 bytes
SHA-256: 237c80ec734057fc39b603bb2f520e4c0e71659b0dbf40164c0aab273fe31b86