Malicious PDF — malware analysis report

Static analysis result for SHA-256 97effa48762dddaf…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 00:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df66c4f5ceeb46848a2ee8102d5bcdc2 SHA-1: eef7b0936ad6357424a0ccd6c165524fdd7701e7 SHA-256: 97effa48762dddaf6358d4f9463ffef568a10ccbe820b9c93bd93b53607d3e23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with a high number of external URIs pointing to various PDF files on distinct hosts. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the download of other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ccadl.com/files/20210911140005.pdf In PDF document text
    • http://orosweb.hu/userfiles/file/86647592166.pdfIn PDF document text
    • https://bloomeng.com/uploads/ziwuwofi.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wuvaxagefifupizifiba.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090218144066.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/76863049880.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/walirulosevudorisekomo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130aec97472d---biwem.pdfIn PDF document text
    • http://webursitet.org/Files/file/devudazugotobitisutumaja.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/89020173969.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/11417398212.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/wilabanigaf.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/60999943519.pdfIn PDF document text
    • https://hgb.se/filer/file/28037742940.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905075440.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/boxatexis.pdfIn PDF document text
    • http://zamgph.com/uploads/file/020836397476.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091516433739.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4de96531---sililosawijixepagejav.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/61092763090.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/golokofo.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/18382946025.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/64926676992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=big+hunter+hack+apkPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 17464 bytes
SHA-256: b831d9e33d49cf43d43d6cbd4b9a3438a90dca90f40565ab569fbb362978e48f
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10564 bytes
SHA-256: a82728363fc2dfd21c63bd17aef3926240026a590cbb3b5e01aa70100c9b320e
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.