Malicious PDF — malware analysis report

Static analysis result for SHA-256 409accb6871ee3a8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 19:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5866a401ef747bc2cc78ea4a1c849622 SHA-1: 3ca26279b96d9df2a2e1fe88d34b437f08b3843d SHA-256: 409accb6871ee3a8216766258a7a51df8b3324ae75759a240cfb6a39972381c0
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=bubble+shooter+dino+shoot PDF link annotation
    • https://erdemlerkoleji.com/resimler/files/xidufigiwutemusuzim.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/39846709931.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/98313270426.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/94289408556.pdfIn PDF document text
    • http://nanopena.cz/upload/file/42167774311.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/mariwegisazeka.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/24646268113.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/91233850298.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/47717224358.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/padukipukotuwonisukipu.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/80258014293.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/letuxawojoxa.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/88733795706.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/86064827089.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/xogiliduxabitepogina.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b7f91c77bb054e1ea05f29453d604315/podamit.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/83089576538.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149826dba2ea---livave.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jewidizataragazeju.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/zuwekiwonaw.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/84527764682.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/fimerabodogakeli.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191011191012.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 17724 bytes
SHA-256: f1e76a2c6751ac04a15113df5818f2c05298877c1f6ccb318f1fe82b95f5c48c
font_01_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 10476 bytes
SHA-256: 88d65e973606394c4f5a4e254b5caef449bf5fe50a31eb8b739883758a3fc764

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