Malicious PDF — malware analysis report

Static analysis result for SHA-256 c418dd635a84952d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 07:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1048a82d1ec3fe7c0d9265c27dde5929 SHA-1: fe4074281b55cd6f3947363988ddcd87f4b6e9e1 SHA-256: c418dd635a84952dac62f92ff573cc905bfe7c1f5363fd32cbd8c715952f89fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, with one URL containing 'android porn games apk download' in its query parameters. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://italvaping.com/file/46070372408.pdf In PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/17930402862.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/nureb.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/matikunak.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/43258278045.pdfIn PDF document text
    • http://annabarons.lv/files/files/96325189969.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/14630240755.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5b08c4244707ba2816f0426752533e4f/46132272047.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/fisuwulapuretilelowix.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1mqs6f5dm57a9qo2274lgk76mq/risuxijipefamiredivuke.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/96102254541.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/43920010767.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091621290373499.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/51509114480.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/melopunubakupivimepax.pdfIn PDF document text
    • http://sdes.in/uploads/21974681393.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/wiluwomujopizad.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/fabuzifopizosexetif.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/dogotajemawapefelodelofi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/93019352474.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/67156265685.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021982227396238.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/55304970312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+porn+games+apk+downloadPDF 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_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 10796 bytes
SHA-256: b85d9fd75825d3e1750c8dc48f6eb14f579f438d3957f871a75b517b1d7a0fbb
font_02_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 17924 bytes
SHA-256: e9c41681b2a36e388f06f0e3532fc4e404e5e4775770eb4f8752fc395637b931