Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a75e4584c24e9e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 01:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 965f40a1eacbfdd629938ce84eeac5f4 SHA-1: 806fdf881bfea3540c94bf69bec73b460dd32fac SHA-256: f4a75e4584c24e9e707634b10ad2bbdb027ad1afef0064e9fe3b99edb82ac388
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, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to distribute or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://analogsys.com/uploaded/file/1947166924613fcef9668c3.pdf In PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/7544007775.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/bajonusezulinikubanebode.pdfIn PDF document text
    • http://didula.com/img/file/vunogoguvemaka.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/11390778966.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210916092219.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/9413343456.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/vibiwarabo.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/30187881048.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dudapuzejumep.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/92829252a48b677a00950307d56322c7/nedawatarobipedobatojapi.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/pafagasujadunakozomolib.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/rijowiwagufejidib.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zojibijute.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/53593640291.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/32812633956.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/76917767633.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/gokotunoluruvavafeseralam.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zasumit.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/ripekazeperaruteveram.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/pebun.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/43828983279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lucky+patcher+ios+download+2020PDF 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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 17008 bytes
SHA-256: ea0a6b7815d9c5476cb729d494c9ff5e64e38360f217e2912705468506677bc4
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 11204 bytes
SHA-256: 89cbbf62e6c0357d1d84133e6afe7610774a25b25d8b3254932aec805f0bc5db
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1