Malicious PDF — malware analysis report

Static analysis result for SHA-256 8469548b7c09c203…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37b3b2d270cc98e4ce9fca6dd873a088 SHA-1: 54ab32068436c5549e5f75ce7f1b39327cfc3b98 SHA-256: 8469548b7c09c203c7d99eea9aac0c9f4937f5d87ef107875c28723aadfc79e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting it's designed to redirect users to potentially malicious websites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or further payload delivery.

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 https://synerhu.ru/uplcv?utm_term=harry+potter+1+epub PDF link annotation
    • http://sahrugs.com/userfiles/file/28411197413.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/luramutipinowepub.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132655c914b1---37697981000.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/94595062072.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/89135033778.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/tawubesojajinomobug.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/naxoberigale.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/16057354569.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/joxazulewetazuwoxoreti.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/5766800098.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/60020349898.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/sugoluduzig.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/84471428807.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/43249985335.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/15182750975.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/34356351137.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/nalagezonem.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/desufuzejobajafibemo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fsg1pih300iooj3tjtp3d9rqba/35433520712.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/faxakekof.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/lusudofelofele.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/80058299895.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/3190718983.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 18664 bytes
SHA-256: b504fd50942cc4e13d5fbed02a623a7e505a83bde17f362524211dca233b173b
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 10232 bytes
SHA-256: b921653744f0565904ddb71900ce08bad6ae3a484f770731aae5f5b3438113b1
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1