Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9a761fb5f0c923…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 18:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82f1368bb60a14d30fed801fb52be259 SHA-1: ef1b6dbb794b244caa2db9b034f53568c621d06e SHA-256: 6f9a761fb5f0c9234869e6e96e525aee39ffa8512e7ff3bbc161ec5f52d9eedb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bepxuyenviet.com/upload/files/jopazivekip.pdf In PDF document text
    • http://jingyilin.org/uploads/file/sobov.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/tifilipevuziz.pdfIn PDF document text
    • http://jadeite.ru/images/file/12686093802.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/xezutorejurefede.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/99209000241.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/rowixesadupunakij.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/64315545471.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99db9ed16---8240221379.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/11804541229.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/dezexorabevikixirevakomes.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/fanujeno.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kinanizelaninufovawu.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/nijesad.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/buxuwarulad.pdfIn PDF document text
    • https://afayl.com/userfiles/file/20822671140.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/4525557766.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/41da83c03eb857e1fd381962e605721e/tobokogosiw.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/wifazu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/tamotopavevinodenowupetip.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/nowonituxopiwa.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/49926378458.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/xovitevasinubizosojikebip.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/7276809924.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/sojofigakavitoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mvi+player+for+androidPDF link annotation
    • 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_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 17424 bytes
SHA-256: 38d8883370f0217d9102741957f0c71177f4ed551ad1202ad109a5db005028ea
font_01_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 10396 bytes
SHA-256: 2b849bbd38cdae287c83ca90918dba7dc6bb8edc4066c6eac336d1421b18d5e5
font_02_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1