Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8f64e0c93bd701…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 04:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5c2b92e99b0bc59ac3bbc12791c8941 SHA-1: 1e095b381cd8108d5a2f1adf1419ff1152c428ce SHA-256: 1f8f64e0c93bd70152e138e0ecd2c4be8469fabed94abedc2121d122da4a2df3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and numerous external URLs suggest the primary purpose is to redirect users to potentially malicious sites, likely for phishing or to download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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 http://purepoem.com/resource/docContentImg/file/2021-09-17/7809946d30d94ddc56bcc165eede32e1.pdf In PDF document text
    • http://tscyw.net/userfiles/file/20210918010605_514fv9.pdfIn PDF document text
    • http://beiks.info/public/file/78136079717.pdfIn PDF document text
    • https://goodline.by/userfiles/file/12782354849.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/nonevij.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/zuwupifatefegasokewe.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/senufa.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/8880743577.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/gosasigirowogubeditalizi.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/86582680876.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/76068667990.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5155ad903825b3298d9dd8cc61e3e0bf/35449615382.pdfIn PDF document text
    • http://mamam.by/upload/File/file/vugulorelujet.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/dudutezupofimikodamok.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/sipumonedew.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/lejiguxuzadarorimekituj.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/ripatujifaxumalewa.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/bafalojisovageberopi.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/18539452980.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/xadob.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/49162159951.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ruwuveraxenobofukolasasik.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///55356884724.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/jijekupevofokukujupam.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/zenuzaguga.pdfIn PDF document text
    • http://bamila.vn/luutru/files/69586661567.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/jidisubipodabokuxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pineapple+bread+puddingPDF 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_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 15556 bytes
SHA-256: 5dc72dc0610a44cb0304fa2fd92d085e5b1a961cf600e6595cb512a082a7758f
font_01_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 10424 bytes
SHA-256: c61494883001389e2b73646fc52155ab9f489ca03b408535d27beffaa8e026d1
font_02_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1