Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd96951281cc7518…

MALICIOUS

PDF

68.7 KB Created: 2021-04-30 00:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ea72e6f07ced741348ef7491ae797fcc SHA-1: 2ebb032ccb3d115b7552fd6ac49709342c814280 SHA-256: cd96951281cc7518db258fdf7e47d99279d8fb014af02a452639b43313a45b81
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to various websites, with a significant number of these links hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=english+1010+book PDF link annotation
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/rupokojusezete_lofirade.pdfIn PDF document text
    • https://tosojeravi.weebly.com/uploads/1/3/4/6/134617838/d16b28.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/xolebuna-lifak-nalabemo.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/building_preventive_maintenance_checklist.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/academic_writing_task_1_vocabulary.pdfIn PDF document text
    • https://xomilazarega.weebly.com/uploads/1/3/4/5/134511507/wijajamuxube_kevif_xudixojasujutu_mobigakokafeki.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/xoper.pdfIn PDF document text
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/sowojibozutowef.pdfIn PDF document text
    • https://zivumipit.weebly.com/uploads/1/3/4/3/134317334/8f5f12.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/12136301796.pdfIn PDF document text
    • http://kusulapezep.iblogger.org/23884344359.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/nosewexexavosuwozimo.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/baposivarabuj/jodowiruzupat.pdfIn PDF document text
    • http://gevitejivojo.rf.gd/wagimeteni.pdfIn PDF document text
    • http://zolasot.rf.gd/26575683831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e064b4-4e16-4c31-9e7b-f90ff2690c91/59676279292.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/wemesepogopoj.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/learning_apache_flink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecec8c6-599f-4d07-8ee1-5c4c7b2f7599/how_to_use_a_cleanser_gel.pdfIn PDF document text
    • http://zemikajinemoxi.rf.gd/iphone_khng_c_c_file.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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 4996 bytes
SHA-256: 659ea23f626309b12e9c1109a87977023600e54898795a17b6d7988667bf5c8b
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 10352 bytes
SHA-256: 74046de15b4c75b7aa9bee4f9ea4d40a085b028be8009a7fbe7f71e61c78c02d

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