Malicious PDF — malware analysis report

Static analysis result for SHA-256 f087c450adf33520…

MALICIOUS

PDF

97.6 KB Created: 2021-09-18 14:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 031fc5592903895a80b2c85be6b4e88f SHA-1: a71bef8ced22beb80e859fd924d856d8c0465222 SHA-256: f087c450adf335201a5802e15b1871058dd8aabb277ef2c07877606e62008db2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://bn-biz.com/userData/board/file/17285492780.pdf In PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tonarugugukewozulakado.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/31041964722.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvawakoxovuse.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zidegujobivew.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/pigor.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/71814287747.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/pivogalakalodawewexaw.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090701503773499.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/raropuzimuxamamoduxa.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/10027086283.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/75457337172.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/nukirigolepijenuvigo.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/tezopuz.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/wizezakifiludobabemud.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/jatejutabilifisefapuvixi.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/60044877576.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/xatigitewusoxagidogewigap.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/80496659820.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/medufinedobo.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/dirazowativ.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/gafogujava.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/derepupapiluxifobeg.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/18085872767.pdfIn PDF document text
    • http://etkenkalip.com/files/xaxawekanutarojebikururo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/juvabakumufuxijebukepefa.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/28848303532.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/38379679487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=xmpp+android+examplePDF 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_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 19428 bytes
SHA-256: aef3f744ef13ea7a5fa202fcfefe8f8384c21a65d7135ddc9d2b824bc191d7c9
font_01_sfnt_off00014908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14908 10396 bytes
SHA-256: a887b62d67854609fcc93d2b971fd7b908dffddae8664037076ff57f55f205b7
font_02_sfnt_off0001605b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1