Malicious PDF — malware analysis report

Static analysis result for SHA-256 6821d53008715e04…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 11:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c68762425d8b1a484d073fce18ca50e SHA-1: 9c393e080d9315c4372a5c9949c37101a025a210 SHA-256: 6821d53008715e041f89f7f0b140370f4bc07de0005c5af511c374560283f760
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=minecraft+apk+mod+latest+version PDF link annotation
    • http://wolfpackbasketballacademy.com/content_docs/10793746402.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/41187541000.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/97699449715.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03d48e7ce---sadununegofujikidojofebab.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/62270101175.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/madaduwusumeto.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/97754599116.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/kexutabarusinajuwotaluko.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/65727703602.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ab4bf43d8e3bec95d605052a4af98951/76792432064.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/98241503424.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/72501604342.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/66954560848.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/63597178213.pdfIn PDF document text
    • https://phm.vn/upload/files/tagejaj.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/74380043502.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/figan.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/gejipenodum.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/woxovifotoxalumufuvivul.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/75841035846.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/dujufakexunedule.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210918122130.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/66237930327.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/xipulu.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/gevim.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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 17532 bytes
SHA-256: 62c8b88095d77b0ae34bc8b4436d89d4ba0326ef8892ce683a9e1340286f954a
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 10932 bytes
SHA-256: efe8a904c589368c5e662f6ea1f186af82f9eece5fcac6a7551ff2b40b051759
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1