Malicious PDF — malware analysis report

Static analysis result for SHA-256 486477da2fdc1d14…

MALICIOUS

PDF

90.4 KB Created: 2021-09-18 15:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 83ce40677146af313a7bd599954da787 SHA-1: 2db3ce0180173f673fbfacffce8923cb7156c0b7 SHA-256: 486477da2fdc1d14f98a4ecf0608fd7ebdddabcd9a5136cab9b43885ed4ad070
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=best+instagram+unfollow+app+for+android PDF link annotation
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/59369876114.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/watewotapuwiladog.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/11880618453.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/73473789298.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021918956484589.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/76116441021.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/volawosurax.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/bofefatunatapumav.pdfIn PDF document text
    • https://theurbanthinktank.com/files/33987932267.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/jemodejonitilokejinak.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/viruvafonedebalin.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/wimimageperuw.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/gofuduzetasikata.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109160624154960.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/88946545427.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/47197920415.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/42765086493.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/70570874248.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/jowovepikaxunebav.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/32005596541.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/99416305446.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/vamepoxubi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8df26b47---17073774266.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/36349967931.pdfIn PDF document text
    • http://talesma.com/E/file/sefogazokuwaponazofo.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://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_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 11080 bytes
SHA-256: 40c054806c0d4dba748df10ea5948498cd65290f3c59d3b134de72a6a116f1d6
font_01_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 17232 bytes
SHA-256: 96e79a0f11d21aeed64db9b04cfa0e765a26a687a466ac9eda6a0a8738595af0
font_02_sfnt_off00014944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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