Malicious PDF — malware analysis report

Static analysis result for SHA-256 28758a23cfa9d03b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 00:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea01470c5b5b80a8dffb87d50fc36040 SHA-1: 3b1f699d728b7905e897db00cf8be4fe5e49e9c2 SHA-256: 28758a23cfa9d03b273881dece2306a66c434054b2dfb370e6750db5cbd5a1ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and exhibits characteristics of a phishing lure, including an image-only document with a clickable action. The embedded JavaScript stream and numerous external URIs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=roblox+hack+download+for+android PDF link annotation
    • http://mn-print.ru/ckfinder/userfiles/files/65449061054.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/90664326185.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/sizaxuduruviromoriximuwim.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/10410944934.pdfIn PDF document text
    • http://enricobarraco.com/files/jowaduwe.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109161056362061.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/41695347.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909031010.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/79552829870.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mititovozesesogizenix.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/xabis.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/85910796033.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/xozefunarigamesejunabo.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vumulewakobet.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/12805161108.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/16083018464.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3ucpfdq2m7qia4l9r2f0tm0jqu/87227911003.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9588bae91---siluligujopajume.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/kofalegode.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/59569220673.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210913032136.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/60446472236.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/24382837352.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090202231624.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_off0000b2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 10640 bytes
SHA-256: 903cbcb4d16ffe100e795957f9acde4a6f8439449488247022a1dafcf60df4d6
font_02_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 14060 bytes
SHA-256: fe21d2f2371cf04bc78252586ea0b6931921754df2f6e60f297f052c211d29bb