Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f04ecdcb41ecbf…

MALICIOUS

PDF

149.8 KB Created: 2020-12-26 10:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 48ea3c1cc434d166b3e1bc4a17c97c89 SHA-1: 2805940493123ec38b82d62dc64ef50e3e0b81c1 SHA-256: b2f04ecdcb41ecbf609c94556dcac5960be7495a40e1166f1fd02edcbc8a4106
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heuristics indicating it's a malicious redirector, specifically targeting users with a lure about 'fun literacy games for high school'. It links to the URL https://traffine.ru/strik?utm_term=fun+literacy+games+for+high+school, which is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=fun+literacy+games+for+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_5fb9ce5688086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5f96d210bdd49.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/9775821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f8a144860b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5fe6d10f82b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_5fbb6d23179de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8ac0c91b34b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5f978ad17e246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_5fd85a84db341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f93a22b94b43.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/jivuxo/past_simple_and_present_perfect_passive_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/facebook_riddle_answer_7_am.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/26078353268.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_off0002133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2133C 5352 bytes
SHA-256: e8d4b908fb71c72c682ae20a3b554d4fc58ae4331761b4769c6bed765a8cb0ee
font_01_sfnt_off0002254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2254E 10672 bytes
SHA-256: 0f66179bdc9be678c2631a7606e7d70bbf167222f24436e8388901bbb6ae4bd3

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