Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda6c4cddf5d4f25…

MALICIOUS

PDF

92.7 KB Created: 2021-04-05 06:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8c896df4821ba89e6e4bbaf5a5093241 SHA-1: 62f66b979c23c2b352b0ea837598c309c4f9fa69 SHA-256: eda6c4cddf5d4f259404d934d050cec19cb3851c1a4c8821a3f05bd253e6b7b2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a significant number of external links, indicating a link farm or redirection strategy. The heuristic 'PDF_SEO_LINK_FARM' specifically points to the generation of numerous external PDF links, with one prominent example being http://xtina.online/codeigniter_upload_fileheu7d.pdf. The presence of an embedded URL also suggests an attempt to direct users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • 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://jumiwimov.ru/strik?utm_term=oraciones+con+verbos+regulares+e+irregulares+en+pasado+simple+en+ingles PDF link annotation
    • http://xtina.online/codeigniter_upload_fileheu7d.pdfIn PDF document text
    • http://generalmassage.online/20660732229xg1nm.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/niriwu_rafevajefa.pdfIn PDF document text
    • http://universityru.fun/nafamamonoriwabumahxq6o.pdfIn PDF document text
    • https://jegetujo.weebly.com/uploads/1/3/5/3/135300600/domevuses.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/katamowowidzqcco.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/30781149891.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/jutaseju.pdfIn PDF document text
    • http://handler-autoscout24.com/967293547210sulu.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/what_is_the_best_robot_vacuum_in_australia.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
    • https://s3.amazonaws.com/difigomisosak/53116763178.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/theories_of_administration_and_management.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/badnam_bengali_movie_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/jizuxiporikatubo.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/bemobi_java_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615740a5-e2c5-480e-b5d4-e08907d8192d/what_is_a_trust_in_the_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/17316533216.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/bavogelobufulibagami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441dc359-507a-4a67-8dd2-9ab95ccf69e1/45218964965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d32cf4a-385a-4a29-a2de-fe070a27a90b/35544839802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d28f94-1170-427a-821e-739669bcd8c0/mipavokane.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/windows_7_pro_usb_boot.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/41183241952.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 5420 bytes
SHA-256: c8709284493fb32a180e8869da4f4f1e234023a96c4b591ed262b494739eec56
font_01_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 12328 bytes
SHA-256: bff75955dc0890debb82237782bb2983ee1e17432b12ab5e68c7271921ebe62a
font_02_sfnt_off00013cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 16584 bytes
SHA-256: 600eea37ef3b67c20f79878a3019f1f8ec70f274b57bf326574478c9d086bdbd
font_03_sfnt_off000153a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e