Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b94aa3f2ff2bac0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 01:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ee2483777b61f28aadda167fb611d19e SHA-1: 09c23bf7264ef6f67bf5502b8d09421d9a699599 SHA-256: 5b94aa3f2ff2bac0438314bd6d0688c71e1a06658abc694789dc1a0149285994
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=123movies+avengers+assemble PDF link annotation
    • https://sanvexe.vn/webroot/img/files/dabezeboditub.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/13759493591.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/98898585878.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/wulaxekoposos.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/29307973918.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jifudaburazegisolatumuded.pdfIn PDF document text
    • http://splogservice.ru/content/files/57710116458.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/darobetabumugamovemifupop.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/gusipopivijufuvazajosev.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/13983663920.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/27580555022.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210905215909.pdfIn PDF document text
    • http://ipceurope.be/assets/file/jimizirubet.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/64a392f270422e532e2f6692ad021313/mukigerebosobed.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/81911872923.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/defolik.pdfIn PDF document text
    • https://anandalaya.in/resources/file/telod.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_E6226287307E4D62.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/42017823455.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/matewogileriwep.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/56716386613.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/45d1ba4ff48bed0a6ab783bc3fa3298c/gesegojujedotevijej.pdfIn PDF document text
    • http://charontrade.hu/data/file/87209145851.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/bewavuwazati.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_off0000cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 19180 bytes
SHA-256: 4b1cf4f68aac8d88090c0f7f404f20b3a6640c980c794cb9364cbb6f0ca133d5
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 10804 bytes
SHA-256: b23f99765b198ea82cf2d60f6090655c01ba83189a60e67bcdbe0cbc34615cad