Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdbf14d25247e08…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 20:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 534dac8e56f5ff6d37d01c892a298f78 SHA-1: 35278208c93a58df06beef1ff6642aa4e0631b63 SHA-256: 5bdbf14d25247e081d3faeb912f822afb1a6be7b6f7ace21feee6c96aa6912ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature. No scripts were extracted, but the overall structure and URL patterns suggest a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 https://inwebjor.ru/uplcv?utm_term=nikka+zaildar+3+download+full+movie PDF link annotation
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/vumebabab.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/54486571565.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/77456614450.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/86142104263.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/71611548618.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/motozejasokuz.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/93807203625.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mewakowugaxuvobumof.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/36153607250.pdfIn PDF document text
    • http://recrute.fr/files/files/wamebuga.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pizuretumezenodu.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109041634397731.pdfIn PDF document text
    • http://mobil-tech.com/files/votadosuwerigonetenumad.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/duseposalutogabugogo.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/57230564247.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/rexowet.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/36118317602.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/49739742385.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/redinunamosexuzude.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/6602503084.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/nojavafamimezaduzujenudag.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/zabegidirepebagopide.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nonivofejetadevevifiseg.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/20532541887.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/ludojojeraso.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 18000 bytes
SHA-256: 49877e3603a1e9379c8a734b6f6ef80daffa2be10f3f08e867642a20f6ca90fd
font_01_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 10800 bytes
SHA-256: 05fde2b64b46bdd5137ce0837a851b1c19b1e12b12e495777fef83b1980da13c
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1