Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c78d420cf765df…

MALICIOUS

PDF

67.4 KB Created: 2020-12-16 23:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3b5a24db661dc557ecafbc975413b70e SHA-1: 09e88994abf78778b6ac34b1048811111f92f9dd SHA-256: e1c78d420cf765df67d5a498a0475b783c75ea94a5f8c6c38f53ca12362fcd4d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attack.

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
  • 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.
  • 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://trafftec.ru/123?utm_term=realidades+2+capitulo+5a+workbook+answers PDF link annotation
    • https://wivujawa.weebly.com/uploads/1/3/4/5/134582083/denijep.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/34938d4b6eaa9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0de27085bf90c0efce9ba/t/5fc144313f75b16643031890/1606501426278/fategujeladavave.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6617717e72026400f6ae7/t/5fcf287d10aae775716affb1/1607411840237/hp_smart_app_ios_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9d1684-5b9e-42f1-aca5-b12b62ab7bd2/journey_to_the_end_of_night.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce05bb90e5b06becb3f5d4/t/5fd709a1e5ac58289638f85b/1607928229756/xozizagizeworepovirum.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5dd1224b06a7eb3219a2a/t/5fc8d7776031f4738629703b/1606997880622/64750116157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6c21d8-d164-42a9-994b-63d783d3fe53/23965508613.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3676dc6d96458363207a7/t/5fced0a524ae147ef3cbe923/1607389352283/94745774042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1474a733-7d11-460a-95b2-b06641ba3483/95021710177.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38cc4405d5340f33a5a23/t/5fc591433c02f22b9dcb4e4c/1606783300074/pajalidesikipofu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fc2e65d3c6ccf69f3bea749/1606608478607/john_wesley_preaching_in_ireland.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_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 5628 bytes
SHA-256: 3f28e0b75d6d1ac1f675218c5c08f2cb2314bfcdbb344b706421701aad047a9b
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 12624 bytes
SHA-256: def7878f5d05491ff3f639687d69123cc951d34a69280fcc57ce15e570ebb185

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