Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5669853a4dc396…

MALICIOUS

PDF

64.6 KB Created: 2021-02-18 04:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bdd67e1f9bc2d531c64c906bba8c2513 SHA-1: 911003da70f5716e15ad2c762ed4af50509542fe SHA-256: 4a5669853a4dc3960f4fb5ec76231fc2820a7b6ce89f4ad232f568af9186f3f3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://seumenha.ru/wix?keyword=kings+mountain+middle+school+athletics', which is likely a malicious domain used for phishing or malware distribution. The ClamAV detection and ML classifier further indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly suggest a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://seumenha.ru/wix?keyword=kings+mountain+middle+school+athletics PDF link annotation
    • https://wemupubipu.weebly.com/uploads/1/3/5/3/135331653/d36c4ad1613.pdfIn PDF document text
    • http://sanegofelofut.22web.org/bapubesalavus.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/661e7152ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tenunud/55469463686.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/tudajisojolibizebobole.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/baseball_uniform_creator.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/holter_lake_fishing_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/ich_guideline_for_dissolution_method_validation.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/present_continuous_tense_worksheet_for_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/c-_band_alliance_formed.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/vinatujikomapabobekubaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/metformin_hcl_1000_mg_oral_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/97637155036.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D1 5228 bytes
SHA-256: b7b4443ff5745d7ee332af06bd71abb634843fcd517dc28693dd94cc861dfbdf
font_01_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 10284 bytes
SHA-256: 81521e61c1059fe64e2d6560ba01e92cb38274b143b57cf74a4ee1e287cc5977

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