Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7828636b077febe…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 07:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6d9b6692c07a8d2f49bd3b35138846f SHA-1: f5f58a67a143fa9e3654d2b1fadb48b32e2d15e6 SHA-256: d7828636b077febee457796f2ee64124d508b9a93da341704982aac185a80b0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with heuristics identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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 http://kovacsoltvaskerites.hu/images/file/42633410344.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/505d65587e9c4be38527a823224ee45e/77697652263.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kolafufusumanomewakiva.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/bowedinamasibis.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210914084338.pdfIn PDF document text
    • http://wenxuezj.com/images/File/84175799099.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kemiwavuguzupaj.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210906222318_815142366.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/19611734855.pdfIn PDF document text
    • https://airshow-bg.com/file/linurowejolutovijiginofo.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/63598980693.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/kozamikowaj.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/xadumazota.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/55047209929.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/77562916989.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/ponanagope.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vebewitovap.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613304b960838---bobodexanodajo.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/59008948483.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/lupefovovavajirije.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/72041038840.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/buvadixuleb.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/joxurijudok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wood+alcohol+chemical+formulaPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 10464 bytes
SHA-256: ff9467f7c155df4160431e8695867d8e4823ea6be78d0ccf7fbde83bf8d46de8
font_02_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 16828 bytes
SHA-256: b27b955948dd0b01baa6cf7cb0d36f32adc2a57745fc74231697656644e1fb3c

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