Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0fd0d135c17216…

MALICIOUS

PDF

103.8 KB Created: 2021-02-14 18:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ed660ba64bc876e656ad4182841eba5 SHA-1: 1d61502b1a5e5b4e3f5ddd92a115a957fe2ed565 SHA-256: 8e0fd0d135c172161948e708169cf6a8e6f5a51738df58d11e757afad363fc28
234 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure and a high-confidence ML detection. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were extracted, the presence of numerous embedded URLs, including a link farm, suggests an attempt to direct users to malicious sites or services.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=five+great+ninja+nations In PDF document text
    • https://xogosafaxisomig.weebly.com/uploads/1/3/0/7/130739024/7525664.pdfIn PDF document text
    • https://nipixajivoru.weebly.com/uploads/1/3/1/4/131436983/9071754.pdfIn PDF document text
    • https://dewubixire.weebly.com/uploads/1/3/1/3/131398231/taxilokajuvo.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/1190894.pdfIn PDF document text
    • http://it50save.info/afunika_latest_songs_2018f4lyh.pdfIn PDF document text
    • http://avto-document.site/global_reporting_initiative_gri_standards_core_option5pp22.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/lhgjehg/revolut_business_account.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/18bae.pdfIn PDF document text
    • http://rameautbxy.space/rebopevu3mqj.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/4caa3cb917c.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/0f008.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/risisipajole/nezonokevonuf.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/bogglesworld_grammar_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/wulirixajeninufew.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/topil.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/61112203761.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A6 5800 bytes
SHA-256: b9255cc3acab742c86419501a5ef986443b16a4ea63b554521c4399e0048b9b3
font_01_sfnt_off00015d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D82 4912 bytes
SHA-256: 6a62fd7e5720f1d8f3d671cc34b7a997865d588836e256016acb062397ce4ff6
font_02_sfnt_off00016e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5B 10216 bytes
SHA-256: 0bde2bd0823ada5a3034979b8b1ee0e479bf3fd7d4b8e8afd3903e533ced8675

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