Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c1531ba79fd587…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 05:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8129f8a33bb117057a2a6b9069bd3ceb SHA-1: 3d890bb0aa572ac910d8dc33b98ad3d43d09ccae SHA-256: 97c1531ba79fd58711cff8e27c4475c4f0da4cb771922b829556960af3da434b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a screenshot to obscure clickable content. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites for credential harvesting or further payload delivery. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=the+croods+2+putlocker PDF link annotation
    • http://noithatphathuy.com/Images_upload/files/nipew.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/10476109418.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/lusavoneredotifogesaraw.pdfIn PDF document text
    • http://m2m2design.com/userfiles/9640227733.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/42f615494873b5123530f7b914bb1218/64537654170.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fikel.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/5716765752.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zotatezebe.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/vimiwolipasizudekatomosuk.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/18803746171.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/11573635444.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/gereribo.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/kisenivumezozikeganefuta.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ruwumoxividusemegilinimuw.pdfIn PDF document text
    • https://micsys.in/userfiles/file/wexosomo.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/90464387777.pdfIn PDF document text
    • http://konberdbio.com/upload/files/nurewirameregorariru.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/fepabajito.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/xonibetukumor.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/88995124851.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/27141527947.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/zulefapotazuravetelo.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/49656649529.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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 14292 bytes
SHA-256: bd550aace155cacea89999e0326be7a37fb754786ec49cf0562dc57e650d7c05
font_01_sfnt_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10528 bytes
SHA-256: 5e240255d248103f22dbb9d07f15a4c050613b999b222c863482384a5d513362