Malicious PDF — malware analysis report

Static analysis result for SHA-256 a717d480baa3433d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 07:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b209a0aa22854bb53afc757bf9b54c6 SHA-1: 4b1b23f08c1a1bb91a8b21f59845fdb300e0bafc SHA-256: a717d480baa3433dcdf482ef8bc76e26204bfe6570f27b4c64950cf206206668
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate a link farm structure, with numerous distinct hosts and disposable domains. Although no scripts were extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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.
  • 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://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/24490155883.pdf In PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/kevetepejubebulili.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/larekalazedafimuki.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091206142773499.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/77669566538.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bfb4c6bc529a5f1e453398cdb4ddb109/pisagadawumogibejozade.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/45543785233.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/5031901474.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/siraniguwukuvezafi.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/53630929715.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/78187004505.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/6088848544.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/44602419493.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/kegurijogonefokanoxarude.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/78896634575.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/9432091301.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/ligezonetomoluru.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a083f32c8---70648134507.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/volapisoze.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/80047718084.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/rodisir.pdfIn PDF document text
    • https://olajpark.hu/files/files/18571551925.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/dupiweke.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/65945275121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=crazy+rich+asians+free+full+movie+onlinePDF 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_off0000ae70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 14432 bytes
SHA-256: ddf906b51aba41cbfe230c856d5656cc86f931b98bb537491e7d25171d055e22
font_02_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10872 bytes
SHA-256: b0ea337b7b63011cf6d9079f2cc911e6cc68f37b44506afa1219a338236b2c8e