Malicious PDF — malware analysis report

Static analysis result for SHA-256 3630b1a2d7e5215c…

MALICIOUS

PDF

90.1 KB Created: 2021-10-05 12:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 034a34bc99ea9c5bcfb7a2726bb7ce32 SHA-1: f3f14679fe6a301161ae931e7eeb0f6077de674b SHA-256: 3630b1a2d7e5215ca1f6dd371bbbf77990d63752ebfa6a4b64b7fd98b32622b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=example+of+sampling+distribution+of+sample+mean PDF link annotation
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/gujowebawozirol.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/59300082767.pdfIn PDF document text
    • http://lawngo.net/fckfiles/23941152085.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/wudoresezugopibanokurig.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/jagasixivaxeb.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/rojexatokagopitororugifa.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/6310922903.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/41815489269.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/88194997510.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/79998528504.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0a6571d39e92dfdb8d82480ed08481cb/posimimob.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20211002161452.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/lafidofalavumela.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/4975317392.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/gusoj.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/devadefupuxede.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/27044197085.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/saropufopudipaxit.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/togamuraluvovazadadagewu.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nuribulexegepumoteki.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/jorawufedipetujen.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bda793c671d7f40eefbf290c64bc1040/vofusugupitevuv.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210922154200.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/pazamepumutika.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/rexiwo.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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 18592 bytes
SHA-256: 1fabd2b7b06a930542ab6f79ac6d87737ef4bfdaef003da8fd1b95450490a1d8
font_01_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 11168 bytes
SHA-256: ec7a93206319bd36f5773ce3c00f5339dda8ed1f792d68e0408f0918c976995a
font_02_sfnt_off000141e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1