Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f77e68e4af34f1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 05:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43281501bebce780215ae314bb535495 SHA-1: 9470f56159e49c3061ab3042449d57e1c11d6730 SHA-256: 34f77e68e4af34f15858ece5050bda3bed52efbba657a8a99874c330df824140
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trieuduong.com/images/Download/lagozoponoxiki.pdf In PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/tatojebikonudulamebu.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/22731511227.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/40256727574.pdfIn PDF document text
    • https://kapefashion.com/files/files/jasizix.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/nilegusitibozijetivemil.pdfIn PDF document text
    • http://tencanpowder.com/d/files/9821217006.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/guwedomon.pdfIn PDF document text
    • http://savemaxint.com/files/file/gamesu.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wevazomiped.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/rixigamulewuga.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/132303254695.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xedivulatoxiko.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e23b722f9edc08df9420500db4ee9eba/29518126461.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/sodinonexesiwakudusijo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/favijoponinaniju.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/51870555099.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/81914187293.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/671a44b29de7add973142464ef935e12/57918354309.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/gigatumorubeponepazojetu.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/nawejoburoxibulegopaler.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/53269981943.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/fuwulugutofusulujuwovos.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/lijozivavuditexurovasemu.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/1182443241.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/64875014325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=set+screen+lock+on+an+android+devicePDF 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_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 16864 bytes
SHA-256: 74e5c58292687b29fd85294bc9e88901519b1600eac39cd18318e5f82f560e85
font_01_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 10596 bytes
SHA-256: 4d169ca95f6176b086e99b10fa859e77c23cdbc86b6d2c3f886c3012f3b9e910
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1