Malicious PDF — malware analysis report

Static analysis result for SHA-256 8238b76cb937db03…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 12:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37b9171a4858d5d798704384bbf24504 SHA-1: 9823ca89a3b8e590e3eb64cda67dbf9b2163f18a SHA-256: 8238b76cb937db034b0361ed9ae2846f02901fd5ab36b449f21698ac3625b5f2
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, possibly involving a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=transformers+dark+of+the+moon+game+download+for+android PDF link annotation
    • https://hebatkeren88.com/contents/files/7939967629.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/80421707860.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vowasizez.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/kowubefeb.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/3987428805.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3cgnkb9ec1f24heo3s4mip1knv/bogeno.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/51244182107.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/68293102761.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/65916942260.pdfIn PDF document text
    • https://nada70.org/userfiles/file/gedezabobabusef.pdfIn PDF document text
    • http://iknow.pl/files/file/megokelozagizixirutiw.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/paxazatexugujalalus.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/xutujimofurugiguv.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/74225874558.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xexidiwokizidazesibifop.pdfIn PDF document text
    • http://flomojapan.com/upload/files/67998103284.pdfIn PDF document text
    • http://sayarbobinaj.com/file/85349199502.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/51608108249.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/99013259706.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/getazinixufebum.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/mugoxaf.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c840cb501493c01a628f392f4579d638/redelopurizaxomevi.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/25737454731.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_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 18964 bytes
SHA-256: 234c33dd18e9c2d2c05f38a10d031b67d77d1176d34c03cd83d289b2b20aa09e
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 10940 bytes
SHA-256: ec126c980d22c341db2a260a746238b406f42e3e9070180f56fefaa56bb7ad4a