Malicious PDF — malware analysis report

Static analysis result for SHA-256 321cf1a2de4c61ea…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 01:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 67830ee41f33b40e99c99f3f1d7c5df3 SHA-1: c3f217afe695668de6f4bf8300e3a9fecb15f2aa SHA-256: 321cf1a2de4c61ea638d12cbbd86829cf8c5cd5d44e9fb81d104dc83080305af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the ClamAV detection further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://crysiq.ru/uplcv?utm_term=android+prayer+emoji PDF link annotation
    • http://autosklo.sk/pictures/file/zeronalojuzonigoximim.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/7454666322.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/53345659798.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/67486439356.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/27480415941.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/31754921515.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/76072520937.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a9ecd655cd764e6d5cec5428de2cff9/sokele.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vajadufadigejunexi.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/pitikipupodeg.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/79188262573.pdfIn PDF document text
    • https://educhina.mn/editor/files/jibeju.pdfIn PDF document text
    • https://tekartltd.com/upload/files/vuxawatosapoxukasupedapa.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/15632032499.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/16791963576.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/37400394896.pdfIn PDF document text
    • http://aven.su/userfiles/file/2924199099.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/lotavamazurojifom.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/79836550704.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/38936515450.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/rasanum.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/59525638212.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/96922272701.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://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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 19504 bytes
SHA-256: f7b59418aa8bcc9db13b8a53a1da0b34edc67b69b24271e661535f376453970e
font_01_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 10468 bytes
SHA-256: 02c3ddc87d3e1abfec21187672cddd9d659dae3f412e74f339b5b40772dc1701

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