Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bc857cbab5b0b2…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 07:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91a50f4596bd77c6917124211887ec79 SHA-1: 3728a6418c49ffd1cf198cfe63efba19e98fb577 SHA-256: 91bc857cbab5b0b261c5e7e6ca8e997950e1461530141f9f566ca25cd45cdbfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://chandravanshi.com/userfiles/file/jasiwokefuzezukowovonupet.pdf In PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210912_9CB4C803099EBBEC.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/jezuwigabuxod.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/felarumimigogukusinenunus.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/66146549464.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/sotajegonekawozi.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/63481579078.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/kuzawovomeluz.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/fapepilatesinipogipo.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/32061763039.pdfIn PDF document text
    • http://szcftz.com/upload/41463182419.pdfIn PDF document text
    • https://atiksigorta.com/files/49920067736.pdfIn PDF document text
    • https://eurotig.ro/file/23461348049.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/wojozujogepekiwab.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16051c7a1---julomilimevokaramepiduji.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/10357707016.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/99928323810.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/gejanotemukijakunaxi.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/jaxem.pdfIn PDF document text
    • http://zuche0551.com/upload/file/82271224424.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/2239422304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=padres+que+odian+pdf+descargar+gratisPDF 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_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 19880 bytes
SHA-256: 2b672219acd1d4cfeeed30959c96afaba36ba75250c561480ab5fc3ed5b719e3
font_01_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 10996 bytes
SHA-256: a8c2f7fc18bbe2209384648ac35b14eb9e0e3f1dc330eb36dfe0843441a4735c
font_02_sfnt_off00014d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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