Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaee7cc911fe43e…

MALICIOUS

PDF

68.1 KB Created: 2020-11-20 15:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b3514c3b5187982cc571db5749d1b228 SHA-1: bf1c77401837edd8914868cff461eb1de8248cbd SHA-256: 3aaee7cc911fe43e76f755e3e6a497f579cdbe579b1c6504e311441c8c18dbe9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing malicious content. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The document body, though heavily obfuscated, contains text suggesting it is a study guide, which is likely a lure.

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://traffine.ru/123?utm_term=dr.collins+pcat+study+guide+for+sale+georgia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5fa87c19a37ff.pdfIn PDF document text
    • https://gamunuza.weebly.com/uploads/1/3/4/6/134632958/puxazenepexiwul.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/6701035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f91091811d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467030/normal_5fa51c55e97a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_5fa131b77708c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_5f9f1d6e008b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f924beac197f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5f939b36435b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c2910f-3783-4d6c-83b5-f2736269f621/63233421027.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/94810489626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea9f5eb-a2a2-4090-b833-52702832fc57/55403634084.pdfIn PDF document text
    • https://s3.amazonaws.com/fufaragebo/algebra_and_trigonometry_structure_and_method_book_2_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/the_day_the_crayons_quit.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/99165049430.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/carrots_and_sticks_principles_of_animal_training.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_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 5456 bytes
SHA-256: 4d37e7dc68ad9129d0fc1b003d031e73606d678f38694b8b2b4091b9b550291c
font_01_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 11008 bytes
SHA-256: 86709f0debc6f22f34ccc202cc83b5f9823a52c8b216ae7b90e87dd1563825c1

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