Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0216211945baf12…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 11:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adb2230dbae89d4c50ee9bec1dec71bb SHA-1: ec28159f9750db59e4116d24576f7ddc02c41a71 SHA-256: b0216211945baf121622cf89a109a183ca67a05453ebb249bdee5eed6d7b00dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=custom+trades+mod PDF link annotation
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/wigovafomuzunezuligep.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/vodera.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/eci66qico3unnvt3q8g6q1ln8l/sotoli.pdfIn PDF document text
    • http://canoeing.by/pics/files/sugadarukax.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/1159834516.pdfIn PDF document text
    • https://jagominum.com/contents/files/82443375806.pdfIn PDF document text
    • https://basisangka.com/contents/files/18833589479.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/xegare.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/kegazikofozudimitur.pdfIn PDF document text
    • http://fitviewer.com/files/file/minor.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/93197158943.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/lenesosuduwafimagobomebak.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/16901815923.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/79448372160.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/12266148553.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/lapin.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/25282965807.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/bixos.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/kobanulutakopanej.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/14844323532.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/57893250216.pdfIn PDF document text
    • http://gaudi.tw/upload/file/87091310317.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_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 17744 bytes
SHA-256: 75e94f1b663578d91167c7866147b391c46f34412caec49364f2b005a9b70c1d
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 10300 bytes
SHA-256: 239d06e8b64a57be14fc8f25e4235462fe28ab01e0e1011fa8df9c0519d71982
font_02_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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