Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0f2d638089c33f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 07:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c5111d3709470fa94ac3571e3beec960 SHA-1: b615b7c0fbf79efb08a32f1764316337315d8e49 SHA-256: 0c0f2d638089c33f54a3707e2f8b09eba535f289571709ff045748734307d25c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. The PDF structure and embedded links suggest it's used as a lure to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=gunship+strike+game+download PDF link annotation
    • http://englandmatchshirts.com/assets/file/5150006272.pdfIn PDF document text
    • http://camonetinternational.com/files/file/81884893783.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/nosiliwidololuronabomag.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/13420669997.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/wizuwik.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/41496408069.pdfIn PDF document text
    • http://hiniceshine.com/upload/kosijilezuj.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mudalutupawa.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/35575987553.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/60526273542.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/navajudiroxisuwaj.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lipaxijoratazi.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/51227760674.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/84785173749.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/19344906324.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/getok.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kusunomikefobojadarate.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/dudiwigufuxiwokak.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/45978434188.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/67307551236.pdfIn PDF document text
    • http://tion.hu/upload/file/69837483304.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/lufaremuzetarafokevavomos.pdfIn PDF document text
    • 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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 17740 bytes
SHA-256: d1225e97b86b4739d37d2c13247b0b0f92eb2650aba2cf9ca3b2b2d77adc8374
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 11156 bytes
SHA-256: 73352430b20816166d06b723702111bb0939dd77762ff399926def2a09448397

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