Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c5cbaa19ab522c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 23:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61f1ac6e7d2f827a714aece60e7863e7 SHA-1: 47cb3caccb60a25bd39073427813ea2917c5b383 SHA-256: 85c5cbaa19ab522c533aa88eda6f5c092605c860c88fde5ec9ff1b117ab72974
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/67d0597a5ff68c5c141ab39f3684f558/31520867469.pdf In PDF document text
    • http://exmar.it/foto_fck/file/52403282766.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/73234289739.pdfIn PDF document text
    • http://birdwatching.sk/media/file/wutuladaluxuzoper.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/balazipominofi.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/pudak.pdfIn PDF document text
    • https://rais.bg/uploads/file/2978842785.pdfIn PDF document text
    • http://letdentalab.com/img/files/zokevaruxowupamovoseniju.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/74424439685.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/43031097929.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109021347004601.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/powefipa.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mezodiwonovok.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/2992832490.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911040132.pdfIn PDF document text
    • http://dongphat.net/upload/files/75831173978.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613400a6a5141---muzilerenodojorekid.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/mamawag.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/wewatiwowakug.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/dexor.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/94102602829.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/zilutuzoxuzinetesuvoluji.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/68829763466.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/tiwizenozadefaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=keeper+of+the+lost+cities+lodestar+pdfPDF 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_off0000cb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB72 17980 bytes
SHA-256: 93607299ef00648ee91c02453385ba5cc77a1085683b6f615e4a1ec143610095
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 10604 bytes
SHA-256: 8f2b474b06552eb141f179b8c4c8ab63c98a700c37ea65df8d8e5dc5de0c17b8