Malicious PDF — malware analysis report

Static analysis result for SHA-256 99018549424f0280…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 08:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2870956cbcce7962631ce2f6b914aa2d SHA-1: a93aac9c862b442a0799eca5675842c12ad37555 SHA-256: 99018549424f0280b9def425e6a2a3d7da6dd8d304d3ba2b2473d5ba636ed553
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable domains for hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://easyliveconstruction.com/ci/userfiles/files/21181299894.pdf In PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/98160800400.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/logul.pdfIn PDF document text
    • https://mashura.co/userfiles/files/vekijelenudufiv.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/kopodosuletorusonexetewo.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/satogenapawiwemedigubikaf.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/22244679259.pdfIn PDF document text
    • https://topupdana.com/contents/files/58998893140.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/tesalabedofip.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/63617808622.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/pazosumutabefuwogiko.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/tubeso.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/kijelakolopapurojuzipe.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timaxozenijanixob.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/03533aa091271ee27b49347479c9954e/82369995036.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/posuxesudekaxivurupafafi.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/89154594249.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/fegugiwuxo.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/48466863581.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109050501554063.pdfIn PDF document text
    • https://aneri12.eu/res/file/20377678890.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/jajopaje.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fesim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=apk+hungry+shark+evolution+hackPDF 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_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 19472 bytes
SHA-256: 0c33081a0d725a92b955d3b67330c43c2930c39d8a1f403f34d880b5870b9394
font_02_sfnt_off00012b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B15 11008 bytes
SHA-256: b8e669a82ed37cb7a677e720d5d813613be9d1c41b6d55c2126f6dc2d2b4d2fc