Malicious PDF — malware analysis report

Static analysis result for SHA-256 4590830f4deb5fa3…

MALICIOUS

PDF

68.6 KB Created: 2021-10-04 03:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c89e6b7df5d8bfce3766388935788e3f SHA-1: fcc174ffcf06a4deff27dd097999dfeaf8de5b66 SHA-256: 4590830f4deb5fa35066a1d5a433a741738015a86749282563ba5650b6d10ec1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=blind+lady+ale+house PDF link annotation
    • http://carrozzeriabosini.net/userfiles/files/miputadep.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/9933031122.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/tupol.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631955947.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/vapavevasole.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/votoxuzolofufavatuwe.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/76099471547.pdfIn PDF document text
    • https://isgz.me/userfiles/file/gedumuwufofefoxivafo.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/76589541300.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/67252946133.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/88673459179.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/51786634323.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/60389304564.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/nekugivosulurinavubopex.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210906053739.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/gisevotuvoru.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/67627760451.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/5078336334.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/divekakojitusofufi.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/losovofalelevoxe.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/47183588253.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/vejufesajajamakijomofeno.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/90590649116.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/pitejewiwuvoxax.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/90040682827.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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 15024 bytes
SHA-256: 2ecd3c2336ab48472c96e7ed6798967567925bea0170219b6f84ac708269b9df
font_01_sfnt_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 10416 bytes
SHA-256: 893835d680b28d7ba57877691a2da83c5091d06368b1491376e1e2c0dfbfefa3