Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8e4d49568f9510…

MALICIOUS

PDF

72.8 KB Created: 2021-02-20 03:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3e4f667be7007f5b248e6f99d137a929 SHA-1: 26097d24b3a472c06fbaf8103eb0a0f3a0a202cb SHA-256: ef8e4d49568f951002bc33b2845b209ae6e0c6c48371b5f1b9b0a4af40c66fc2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=guide+posts+for+boat+trailer PDF link annotation
    • http://obzorov.site/waliniforozypeci.pdfIn PDF document text
    • http://barashik.space/riletumodipvip.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/c79d985cecfc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5fc78bd973cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_601d2a975ef4d.pdfIn PDF document text
    • http://damvglaz1.xyz/english_vocabulary_test_questions_and_answersd6ht7.pdfIn PDF document text
    • http://eroganoficial.site/74109558117914vg.pdfIn PDF document text
    • http://jsexj.fun/95414115179asg10.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/5382299.pdfIn PDF document text
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/8ed33562.pdfIn PDF document text
    • http://draiwenstore.online/26216404640675y6.pdfIn PDF document text
    • http://eeuuurrrrr.space/pronunciation_guide_latin_plant_namesepb50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juzinaramip/96615432738.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 4984 bytes
SHA-256: 1aaeec8002cb1ed1454b7a8d614cf1b19d624ea6f2b09512b605f66e2da5bf91
font_01_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 10396 bytes
SHA-256: 917d9ff6a7a8e9ad66971817ad88821dc88dc5b56402729864c0c350d4a51822
font_02_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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