Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a393068fbb763ff…

MALICIOUS

PDF

81.3 KB Created: 2021-03-06 12:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 80d8112ec27bea7c97638492e1e6bfd6 SHA-1: ae29e4b4c588980e884484786e5bb8353a4b00ac SHA-256: 4a393068fbb763ff50ad3a594735d07b2a4bfc5dbc0afa15b7dc46152d8f70a3
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The primary malicious URL identified is https://dafemum.ru/wix?keyword=teaching+reading+comprehension+strategies+pdf. The document's structure and link farm behavior strongly suggest it is designed to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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.
  • 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://dafemum.ru/wix?keyword=teaching+reading+comprehension+strategies+pdf In PDF document text
    • https://cdn.sqhk.co/zopezepazedo/iiRPhdZ/86561921953.pdfIn PDF document text
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/9688672.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/haiemgc/download_tiktok_without_watermark_android.pdfIn PDF document text
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/jixalenarekopaj-fowifafuj-zodorodanuge-kupodarisupure.pdfIn PDF document text
    • https://gataforebulor.weebly.com/uploads/1/3/4/3/134337884/10194.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/1836621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_311cb9ba8cb6416185a7ca4da433fdc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/12497632334.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_4f40faa08f9c4e24bd8a6acd9b1ed7e4.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_c4d5e436ba6a4100bb76b0e338e7dbf0.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_e941c111bbbc423bb5614992d412deff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/kabuxomamodemubivukogo.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_a20993bcb15e49bf96aae3291029fd1d.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_f7712f3631884ec89f3b7db55f5eb660.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/add_png_to_photo_app_android.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_d7df8fdc05674e24aa4f9a87924068bd.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_d30e52d6a01e45b39d5805985ce4eba6.pdf?index=trueIn 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_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 5488 bytes
SHA-256: 1d5f183dad8a7be0a9218631a4a7d4e810ce57f9533791a9fd914895f2840b2e
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 10176 bytes
SHA-256: 8bc8553c28fb2047c4a5ecdd9b1bdc88e0f5428a59f7b9aac17a1d28c44a5f44

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