Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cbac8ad8a01367…

MALICIOUS

PDF

68.6 KB Created: 2020-11-18 11:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f6b03b4c821e36e5d22afdc3d4519571 SHA-1: 19c2396308c937aa46fa1b745135871c502ff437 SHA-256: e4cbac8ad8a01367872eec256243b5a26154e16b3efe257a742dce0c2ad4b3ff
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/123?utm_term=ahisd+calendar+2019-2020 In PDF document text
    • https://sewizejego.weebly.com/uploads/1/3/4/6/134679492/2432f72fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f8b73da964b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_5f94a36959ee9.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/rosowasos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f872ce87d939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f8b786384509.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/fidefofudi/earth_the_operators_manual_transcript.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/cheat_codes_for_40x_escape.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/kenmore_elite_he3_gas_dryer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/zatedamuwiviwi.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/61434334193.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/xidasaxefofijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa9dba6-4324-4389-ae91-e19ce2f331bc/michigan_state_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd7a3e8-29c6-4a5e-9046-bf0de97a0f7a/8317423688.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/solving_vectors_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/29500780270.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_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 5532 bytes
SHA-256: 52ca6034ab4db64eb8f6655f35c61f79042306b58bce0340bfefaea72d09f5ba
font_01_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 10192 bytes
SHA-256: 2ff63bacd44fcb3686b2bbe509a9215b9e624ccb120cfdc66a0b4f73072f7e62

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