Malicious PDF — malware analysis report

Static analysis result for SHA-256 44972e897dcb53c5…

MALICIOUS

PDF

80.2 KB Created: 2021-10-04 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 036fd457192274f6bafbba90c03021ed SHA-1: ecc40c4074c8cde0b7462086f6d658f3401792de SHA-256: 44972e897dcb53c5801c7256e456f29bffb6aefa8c0d1b7d8ccc0cb48b1c3638
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency and download button lures suggests a phishing or scam attempt designed to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=allen+jee+chemistry+notes PDF link annotation
    • https://ruiguoex.com/upfile/files/2021/09/05/kixukenumad.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/juvawupunog.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/99456656980.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/37832254113.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/33653117342.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6ffa0d95---25749187915.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/45950029239.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/49755417212.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615695cdbc81f---walojajuzisujuwofekas.pdfIn PDF document text
    • http://peoplefineart.com/assets/202110/files/20211004130443756060.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/89509233506.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/mulimifudojug.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gojugemolosi.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/11730310050.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/rixoluji.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/rokusi.pdfIn PDF document text
    • http://master-vin.ru/files/file/82206000415.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/32162946320.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/satoniloluvekotasenopatun.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/65681989676.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/wodud.pdfIn PDF document text
    • http://dalaichau.com/files/xolizasewasalofewaz.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202108312310446850.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/40605930308.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_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 10560 bytes
SHA-256: d6c82d43ba0bcf866019865e0b36ade92892607dd60bfa74324d4cea18e7d493
font_01_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 19812 bytes
SHA-256: 736e914d3ad27b09937e7196e264a5142195d89a31b7cdcd04969675f48f3875
font_02_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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