Malicious PDF — malware analysis report

Static analysis result for SHA-256 185d71af1690f1c5…

MALICIOUS

PDF

67.1 KB Created: 2021-09-28 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b55bb573a007b25cbae8685c1c14f480 SHA-1: e60ac07d8495b29385c7ebd9e1d16d6191b2aee5 SHA-256: 185d71af1690f1c56c84fc9a30fe2228b175ca12cf317d043e514747a116a070
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many of which appear to be disposable link farm entries, suggesting a campaign to redirect users to malicious sites. The document body is heavily obfuscated and appears to be a screenshot lure, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=belkin+wemo+android PDF link annotation
    • https://stef-nancy.fr/upload/document/gomixoxuzenuremot.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/77019088677.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/belojufurevolojavodeg.pdfIn PDF document text
    • https://xenonsvjetla.com/files/sabozusomunexizapedu.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/sinix.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/37288872874.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021914_165842_716.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/dojogixibunogoraj.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/97212113835.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131493aa54e9---72267015978.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/12365687538.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/82341432523.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/ralivitexevugivixi.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/17819865351.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/84173632869.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/fafukejasewuduk.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jemojidop.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/77103354238.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/kixozawamo.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/17981990334.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/suvovuvumunan.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/mefesizapenokevuv.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/punitavaxi.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_off0000ac6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6A 10376 bytes
SHA-256: faf5fdeaea422345c45c8d27045efe876fd038d60cec02d597a6b2377421c268
font_01_sfnt_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 14216 bytes
SHA-256: 8100239793e2008aad769439f2fe225b523e9c29e5e07a2e3fded964740454e3
font_02_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1