Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c903e76f56b6ecb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 00:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0987fe1954e06a38143bea96fab4498 SHA-1: 4be2387b04bd78a28eac93237cc2d9bf073476eb SHA-256: 8c903e76f56b6ecbcadc5e16543194bd57e71e31f7408e3026f4e9894d594ef3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, many on disposable domains, combined with a heuristic for a 'download button' lure, suggests a phishing or social engineering attack. The PDF structure and embedded links are consistent with a document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=telugu+ringtones+for+android PDF link annotation
    • https://foundryindia.org/userfiles/file/gajimuribefere.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/43895558599.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/bokuvuwasamiwupede.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/31121731240.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/73072560729.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210917065051.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/64269838621.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/77083193488.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/jemuniwites.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/nipurimegivawurosat.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/5324389760.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/63439857782.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/49360539214.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7b24eea6---22309092655.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/bunufumorerusiwokub.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/telatorewakepinelafine.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/96276235257.pdfIn PDF document text
    • https://goodline.by/userfiles/file/30412097533.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/68108754455.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/24525776693.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/legubofifosexena.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/vazeromibumod.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/69628299148.pdfIn PDF document text
    • http://fruitsad.pl/images/file/bewitarimilekub.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xatejoxibojojomere.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/37260598589.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_off0000c149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC149 18840 bytes
SHA-256: 668daf18fabe9327155325c65c8cf5f80fcbe3bba29cd02b177197aab7a7bbd5
font_01_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 10592 bytes
SHA-256: f4e532b0f215d208b20038281b379f7bc895b25ff6da00c2e3c394b1f8e8a3ab
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1