Malicious PDF — malware analysis report

Static analysis result for SHA-256 999c9b70f445eafd…

MALICIOUS

PDF

88.7 KB Created: 2021-09-11 19:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96f20dff56b5c2b5f754baaced4b481a SHA-1: 9ce1863bfe9a931fc74555dfaebd4162ffeb1d74 SHA-256: 999c9b70f445eafdc28fec70d9a10454a6e1c776f2fb24fc3d19ffaa0f0279b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=blazor+grid+component PDF link annotation
    • https://cargotavio.ru/files/file/nogovamijivibadofu.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/gugozaletoborudevovole.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zuvidusirelirewigetotureg.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325789bf8d6---samejaxibilasukobubujo.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/78378962263.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sikadegik.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/gopavagevuzi.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/14110117144.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/39326092938.pdfIn PDF document text
    • http://unibox.lv/files/text/jepuno.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/negogonotafevitagujow.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/79677969697.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210909085219.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/13660323180.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/26517928643.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/28326527105.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/diginageladuxoleninaderu.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/44554789125.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109020931243552.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/puxufimiponimagef.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/puraju.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/gazuba.pdfIn PDF document text
    • https://vleek.com/uploads/files/3863069165.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/7863811103.pdfIn PDF document text
    • http://szm.hu/userfiles/file/lugubepatuse.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/389556457.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_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 17996 bytes
SHA-256: ec5c35a274a6599f784f85313e7d35881d3a07f151b0aa3dc50ad7b5e7f45683
font_01_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 10800 bytes
SHA-256: fe5484d72a79123d66d8d5f6c8d1c90d37c6225d0c563923866e87542817ef09
font_02_sfnt_off00013d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1