Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdcdf278bf51aa2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 13:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b780b8689458b2de708920f00e9ecd6 SHA-1: fd0b11ab4d99ef95bb8f3b514f5050b0d5538bed SHA-256: dbdcdf278bf51aa2f67147637286025e8eeaad4b99bd944d169a5045369a70cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous external URLs, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mimpiindah168.com/contents/files/fobokigisina.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb1677427---wovawejamiwivijupiwevapu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/batubasipavewetiropobo.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/37519151805.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/53167492872.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/bodofojirutagux.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/mebofadur.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/nufosumo.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/38622410998.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1addf05fdd373d3997307eb1cca00693/63172353860.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/82859847017.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/zavagadesawoluko.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///73033960634.pdfIn PDF document text
    • https://phm.vn/upload/files/34608629251.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/55339462012.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/nilojokutetagarov.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/rowulazulupotefefadulu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/14282966075.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/43819331470.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/52726186477.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/fufenedutaganubekorenu.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/74231762348.pdfIn PDF document text
    • https://mollis.rs/files/tubujamiporimatixinonomet.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/lakesunusew.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905000001627309tsml86.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/42090787344.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/42773832434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=11+android+namePDF 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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 10052 bytes
SHA-256: c9c50dbddd12de2b5e70de83dfad543d6a682108cf80d9626ffcf4e64c9cf61d
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 17324 bytes
SHA-256: 376dc298a35eb34ed0d88e798661cfc00cc37335568232957fe9e991841bd534
font_02_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1