Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a72d18b518e18e4…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 17:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23c7fbf28101dc5686bf8f866d254305 SHA-1: a0ff90d3d0c8ef9dcd45d1360b9ec297f4214483 SHA-256: 5a72d18b518e18e445ebca5417022651044687b7751543b880f3a373e588d6f1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to benign-looking documents, but one key URL leads to a suspicious domain. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=martin+luther+king+i+have+a+dream+speech+text PDF link annotation
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/bozakamivof.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/609601.pdfIn PDF document text
    • http://vupiziriwopo.22web.org/cardi_b_music_videos.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/norcold_rv_refrigerator_problems_solutions.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/vikujetanufekuwoninu.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/wezukep/purple_coneflower_planting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/video_er_android_2019.pdfIn PDF document text
    • http://rujesuluxure.rf.gd/the_kingdom_of_this_world_chapter_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/asics_gel_lyte_iii_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/why_is_jude_obscure.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/free_internet_tv_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/ponotisokitoduvidi.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/sos_avicii_sheet_music.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/27548690780.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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 5684 bytes
SHA-256: fb558607a410a60305b317b526d51c41cb9484255a0bb910ffb93644c944b43c
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10208 bytes
SHA-256: 2537ead5600b760e8733d8900a75b64d6c09e7d33721c11891aba1889ddbe671

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