Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dd51b9128cfff3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 05:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ce6ae1ab3d77f34d26240c08382e384 SHA-1: b0fd44ef7fe11473303be588946edcc2c4fa498b SHA-256: b0dd51b9128cfff3f39bc6527dc3d88fc81b8b8722311adc833eecc772255a7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=shadow+fight+3+hack+unlimited+coins+and+gems+generator+download PDF link annotation
    • https://timminsrenovations.ca/file/g2XFc1KRPVOyZHGO.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wikajilafip.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/67159512729.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161347410707ff---tofewewokupadi.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/12835300663.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/48130018321.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/59456423902.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/lojowekusejoxatudub.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3b56e647---dabojexozoxurisu.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/26714382546.pdfIn PDF document text
    • http://kammed.com/userfiles/file/71630759094.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/tigufatodixo.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/zemadalogixire.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/selapeg.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/67128030834.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/73416049302.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/lepexirixojeve.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/99583044509.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xuwupijowajojaxoduvo.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210904235800.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/47627166218.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/tufem.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210902_6120572B59E4FEC5.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/zedarezosefoxegenurod.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/kopafuwafus.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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 11448 bytes
SHA-256: 7cb9711780f9ae28adcdf8aca6264166cb17b5021c175428174b9395f98ea1ad
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 17296 bytes
SHA-256: 4f4ba8f05f8712c8cc08c18afdf2aba6e9d4135fd397b360de04a6bcb3455d81