Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3eb9ea32ba5035…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 04:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba798bdb5b3034dd9c247a404e5d4694 SHA-1: 1d2681cc9c5baeb90438086e128709b1530eb94e SHA-256: bf3eb9ea32ba503593705fb8313bb00390098c748504fffa0f78f5f8d98cc444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting domains, suggesting a link farm or phishing lure. The presence of these external links indicates the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=what+is+perfdump+app+in+android PDF link annotation
    • https://cualuoihoanmy.com/uploads/userfiles/file/zafovepoz.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/97665143563.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/69748569424.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/64027950408.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/sososazogebubanokulun.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/vudidinufuzefofimu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/77189670136.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/6914556690.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0tvooevcqa93g7jijdld826m54/molasotikepisewi.pdfIn PDF document text
    • http://fruitsad.pl/images/file/kulojosolexefizolage.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/76390581045.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/42238875615.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/13769590606.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/tufidipafagorux.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/6283423515.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/59284171526.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/2113354549.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/pogosi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd3c66bfe---34202603478.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rexiziposopexiteborakeret.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/79480053344.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/20460869734.pdfIn PDF document text
    • http://cochemical.com/upload/files/walolemevav.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_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 17180 bytes
SHA-256: f03a252eea347029c6e6a7ea6ec68efd191f5df990fc62e67c49195b8c82fd8a
font_01_sfnt_off000118bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 10808 bytes
SHA-256: 8fbd90ac71ee51e79db251152a9a62ebf964a9a8e0b6a07f105fd231b479454e
font_02_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1