Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0928a0e261a631…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 14:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64674178ab1fb92d48d9d8cee7d39a31 SHA-1: 00f490c3d67af43f7e9c2116ca0e18d651d89ae1 SHA-256: fb0928a0e261a631b7371ff8ee2776ab944c96340e40fa47be9e36e15aba257e
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, strongly suggests a phishing or link-farming attempt. Although no scripts were explicitly extracted, the ML classifier's high confidence and the nature of the embedded links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://www.tramag.pl/upload/file/kapisagumuvefugut.pdf In PDF document text
    • http://positiveforce.in/uploads/files/felonoxuxamoxodis.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210905011314_844429.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/51717331326.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/nepidazagobizuruxowepi.pdfIn PDF document text
    • http://santeh.md/img/files/53217457662.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vimejodugoxigi.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/30799578501.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/96407386512.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/mipatupumivekipiv.pdfIn PDF document text
    • http://congtyvima.com/images/Download/16232710924.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630604165.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/2083351729.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/xenudakaxovi.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/38807591222.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/witigemenurokoluw.pdfIn PDF document text
    • https://cakkue.com/contents/files/67996611791.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/4955698570.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/zirunulexezovi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zuzovisub.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/ganixasudonegevadem.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/43714227924.pdfIn PDF document text
    • http://pi-consulting.ch/download/98171375024.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/zukebobalizi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/372acdff7b13bb82232de1fc34e50b18/96211395141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+fashion+psychologyPDF 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_off0000c9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 10636 bytes
SHA-256: 3054ca979b9c8bee634bcb736f6af73e3896bf761d6049687692d7b1c3493b66
font_02_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 17232 bytes
SHA-256: 0572c597e47a0428e8745014989b89d167c6fe565525d2e7e3f5af102eb9ae7b