Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b093ebe7d121fa0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 14:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee0aea93b7b594d5157712f212f219c0 SHA-1: 9126242a9cd5022654b8ed95305a3a7749db230e SHA-256: 6b093ebe7d121fa038574c76a3856f038a1d63ec8d1aeb36bc0ca1743fcf6b3e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into clicking a call-to-action, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=how+to+make+snapchat+camera+better+android PDF link annotation
    • http://fsf-vastroad.com/userfiles/file/28161533027.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/82673650346.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/24766165058.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/34758949215.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/zikebogumas.pdfIn PDF document text
    • http://rc-modeller.se/images/file///junisewenolez.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/gemotosojem.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909014910447.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/15175465866.pdfIn PDF document text
    • https://palet-school.com/files/files/laguvifeja.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/93084453765.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79a5107d8---98015663318.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141be55b0805---24239014499.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/lulexajuruvolajate.pdfIn PDF document text
    • http://gerocuki.hu/user/file/37370459229.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62795906384.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tisolefodafugujidubomika.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bokemejolaf.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/voxudufufopidevokagikese.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/28927794843.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/46523039501.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/66550721083.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/32957708079.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-9/20210909235022540741.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 11040 bytes
SHA-256: f38c04d8ad278318c4ca5e8c6c80d2f5c876ae8910494f0485b6707fc1e1b52a
font_02_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 19284 bytes
SHA-256: 3689f001aee4a1588601a8a2e740d5dd76d032ece817c8cc6d6df05b3776633a