Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d1887cc6408b64…

MALICIOUS

PDF

68.6 KB Created: 2020-11-17 23:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94c4e40332d661bb9a95b402b36d2dfc SHA-1: 1db34a2b731b0716f7691019dd72a8125bcc05dc SHA-256: 65d1887cc6408b64b45b04e7929e65db4d4ff5ba437b00a5baad3b045ae31230
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The primary malicious URL, 'https://trafffe.ru/strik?utm_term=reading+comprehension+b1+level+to+print', is likely part of a phishing campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=reading+comprehension+b1+level+to+print PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5f995db3045fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5fa053d81ad7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5f94d63cab7f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5f9cadcaec636.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/38fba30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_5fafe94963b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5f9d600ea4429.pdfIn PDF document text
    • https://nonegila.weebly.com/uploads/1/3/4/7/134702729/gafamekagi.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/8ac77e02-9987-4998-848c-769cacd4c935/46225892657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2054cdfd-e50e-412e-9651-b742285ac9ea/25356889438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38927f6a-d0b5-42aa-9856-b7f3c7d9912f/sovinivatezem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8980b3-a40a-4c70-b594-939fb3e05bf3/dibitotewome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4621cd-07ae-4ddb-b03c-7b65bb4c2764/naruto_vs_pain_full_fight_tagalog_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae04c0a3-099b-4ddc-bf7e-1d22998042b8/55809947706.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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 5744 bytes
SHA-256: 35a920ec9ffb5ca148d89f8db7fc8a304783ac64ce9f91fa76accf1bbff206f8
font_01_sfnt_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 10696 bytes
SHA-256: 4c203f7f9c8d5accbcbfc1a9179c8d92a357ea83387494974304f7432393f241

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