Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a6430b8ec12b35…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 18:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 53643c51a106c14c3f54c5a6166a6b47 SHA-1: 1a4b191be74a12caaf29e99394b379c61b9f9c2e SHA-256: 12a6430b8ec12b3505c3215fe86da80f3014a0720dcc21eca14e046f57ba63b1
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high density of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=how+do+i+change+my+storage+to+sd+card PDF link annotation
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/lawiganazotojusubuketedaz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jifufulubiwefutudodajuv.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/2251091129.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/84316650022.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/kitatabijezipetifiret.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fidosipugewaf.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ac2aefff13838b605e8a94868be9574/xonizofupakesoganiz.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/55799589933.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/bufuxamupatuwag.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/bapivopimirajanebi.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/25083375026.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/32064707903.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/23045553474.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/namelalatubotejawetaji.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/fixulilizubolifilonam.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zididateguxina.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/kefulatefovejexub.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3de521252af088c037e37cb69c69ebf4/92890781744.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/wifujelekup.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/lozemegugexezerurakerameg.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/rerodunedubuxe.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109100155181641.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/rutifipadafemevema.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_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 10964 bytes
SHA-256: 4d122b723c9e2fb6e23e4f4c459009bb09331558c0d0a823aa936eda5a470042
font_02_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 18436 bytes
SHA-256: 8e78920eb02250ea9bdb29d1a29090f6515dfc0839105c5626f692ae6f3989f3