Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4d98c0a55d4581…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 22:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c17efa1fd4eb35a862fb03442f212aec SHA-1: b502b9f40898daf02f1f90f60b12810cfce3952f SHA-256: 3e4d98c0a55d4581be201aef2d588a8726a506352d8090e62aa585f992e48f99
154 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and is identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous unknown URLs and the PDF structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://langfordfinancialservices.com/userfiles/files/71059879759.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946ab63361---fimodiniliwupok.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/sijozidisuwuk.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/xezonerepomajapamo.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/60970272628.pdfIn PDF document text
    • http://maxbrio.kr/files/files/59804628445.pdfIn PDF document text
    • http://archbot.pl/files/file/35541936924.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/3456501597.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/97619642166.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76652253761.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/sugupibawodazimix.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/favaterawiwunar.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/99516049612.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/kojirisinub.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/vapanot.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/29949223571.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/redawenisiruxilosizusabi.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/kogaribisigodogukapotop.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/peziwofuselavibob.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/248eafafecc4afa03e15915c3b3e8f80/18347721176.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/3248773875.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kosezikopagizanovobomugup.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fubowadagolilifavabeni.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/siponotunujezogoguw.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/77724776583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=123movies+the+office+season+3PDF 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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 18244 bytes
SHA-256: 6fe86b98bc1473fd324cc0059dba3dc9621823e8e8806e02100f34a0362a04a4
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10768 bytes
SHA-256: c1029531da2179ef60953b4781477a9e228477c395c9d1e6f799290260a1e4aa