Malicious PDF — malware analysis report

Static analysis result for SHA-256 1157cc9a8ace7fac…

MALICIOUS

PDF

79.2 KB Created: 2021-10-05 04:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fed1acc5fc908ea23a93f395d83983b SHA-1: 19d43fc7dac6633ca3caaba6918a3cc6285ca751 SHA-256: 1157cc9a8ace7facd54d18b57c50146ab02b16da832acd571bb57c5b62403f30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to numerous other PDF files hosted on various domains. This pattern is commonly associated with phishing campaigns or malware distribution, aiming to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://studioturina.com/userfiles/files/29410134970.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/xesopakekatigege.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/momeladuwamugeperuwokogo.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/legozazuge.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/webebarovubodezifigipof.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/25204791641.pdfIn PDF document text
    • http://schokobrunnen.com/idata/bisejadexoteveduda.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/lalitatukivatiwesebebedo.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d6c0ac3d---28493301745.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/96580181936.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/39091037125.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/jafolotubidivinefunano.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/37474183069.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16158496a9a4a6---bemuwumufatidiwuwitebuv.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/20388207187.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/71676079948.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/tifoj.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/437570254.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/pubitubemijimawapenu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/rebejawavunolomaxugubuza.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/34630811586.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/ludanezoxizaxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=excel+vba+format+cell+as+numberPDF 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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 17316 bytes
SHA-256: 4514337a8a6874d6c40f180478ddcf39be725ea13af4aee5940dbb17bf73c045
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 10796 bytes
SHA-256: b8cc53e909fdcf4a622a593b36554a39e96f8c330173da5b5a4cdba56e48deb9