Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa1f7d3efd96fa8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 12:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d72d9fccea40a2d7434c35d16747cb3f SHA-1: b3a75fbc70e70aed0963e2a817510555f134fc9e SHA-256: 1aa1f7d3efd96fa8876bcd98f8767997fe46379dc8693d4511dfda2df67fdb0a
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism for phishing or scam content. The PDF structure and embedded links indicate an attempt to lure users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=best+blocking+app+for+android PDF link annotation
    • https://carsen.sk/editor_uploads/system/files/78101263230.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/8723895530.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xetatexejila.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908025637.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/xugijenanapuwasu.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/bidozamekotejibolurivoga.pdfIn PDF document text
    • http://parentini.it/userfiles/files/modosuj.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/72883362190.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zisabojovimuwawadu.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/nesafikabomifeg.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/radutu.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/90170333211.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bobalovedulav.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/wajatiposuboduwizud.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/48383195732.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613945de9a4a6---fojomewotirafijowofonoxu.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/sonozefamezemirif.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/bigetuvoxebanojebawoloka.pdfIn PDF document text
    • https://atiksigorta.com/files/63875145510.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/vizazimaxajefefi.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/73275096771.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/99654873510.pdfIn PDF document text
    • https://isleo.com/i_photos/file/393146512.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/45886628666.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/3835639148.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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 17192 bytes
SHA-256: 7e69192c55604103ebcd29a8b57601463e9963f9d01ecbabd18bf186832108ad
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 11080 bytes
SHA-256: de2267810653349b31d650f6343ab98ee1f0065354e54892a6b4a1e17ba7a472