Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c87e01196fc1653…

MALICIOUS

PDF

78.6 KB Created: 2021-02-21 16:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: edb2ad13fa0bc1f534eece6fba6de501 SHA-1: 8c94b808c3095d44e4fd56d3ae3cbf3c45ef8988 SHA-256: 6c87e01196fc1653d8b87ba8d46515a397d1477f1e318ee4302b715f2b8cadd7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, with one prominent URL pointing to 'seumenha.ru'. This URL, along with many others extracted from the document, likely serves as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself contains embedded URLs and is classified as a phishing trojan.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/aws?utm_term=rainbow+magic+special+edition+fairy+books+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387931/normal_6007574c6086a.pdfIn PDF document text
    • http://pribor-poverka.site/goguvkru43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_602bb1277d059.pdfIn PDF document text
    • http://goodnatural.space/985119192506ps1m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fdbd0fd2b449.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/Y7E4hBX/29119039748.pdfIn PDF document text
    • http://optarfes.com/adverbial_phrases_ks2_sats828cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fdf7f875d7f8.pdfIn PDF document text
    • http://vamoktin.ru/41380841097m023p.pdfIn PDF document text
    • http://generatorsale.ru/jelojetadawozl19b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_602c99eb6b10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_600f9418e559e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepaxilex.epizy.com/javututu.pdfIn PDF document text
    • http://gamugeko.rf.gd/pepsiman_apk_ios.pdfIn PDF document text
    • http://wifobujaxude.epizy.com/naming_monatomic_anions_worksheet.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_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 5880 bytes
SHA-256: 705bd11b6aacbaa9e6a31a5db0c3701699925bf36e017d514e8e8d4380f9564b
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 10892 bytes
SHA-256: 26da0d945db9e48a77bbfea3ca0023dc8fbc22105f8e95e0d0dde0d1215e0571

Open this report in the interactive analyzer, or submit your own file for analysis.