Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d37a7252ed7e2ac…

MALICIOUS

PDF

74.1 KB Created: 2021-05-11 06:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: db046af7b042a11a832569f22aec519a SHA-1: 58dd5a131942202da993d069f2a72ec736aabc0b SHA-256: 7d37a7252ed7e2ac7fa39bc94cbe7caf65b419b142244c5766890e57fb29219f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier also provided a high confidence score for maliciousness.

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 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://resalured.ru/strik?utm_term=what+is+the+remote+code+for+tcl+tv PDF link annotation
    • http://bixuvukulizolu.22web.org/alston_publishing_house.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5ffa444ca1984.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/17506916837s8sao.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_6054b37026f2e.pdfIn PDF document text
    • http://bestrongbyg.com/hacker_dragon_cityr7kao.pdfIn PDF document text
    • https://cdn.sqhk.co/lukizigerex/7je1rgj/word_crush_level_845.pdfIn PDF document text
    • http://kersita.fun/mous_limitless_3.0_iphone_11_pro_reviewy9xom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_5fdb89b6c556c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_603b0aab1d249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_606d3af7d1b67.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/Sbw1DJj/coloring_book_apps_for_iphone_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/giibHhd/nibaguzov.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/lokijuronig/nakoniret.pdfIn PDF document text
    • http://gimuluma.epizy.com/350z_coilover_install_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/twist_video_song_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/alice_in_wonderland_songs.pdfIn PDF document text
    • http://zoberutobaf.epizy.com/exercicios_de_analise_combinatoria_para_concursos_com_gabarito.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/brouillon_twitter_android.pdfIn PDF document text
    • http://parezorizujax.rf.gd/tiregudab.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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 5336 bytes
SHA-256: 624673ef2c691e9b5c95c6e22067e6cb0a22c95bfc690c022acf0eee04406e6d
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 10540 bytes
SHA-256: 805af6f2162f8ba26b60ee4b35c49c8f98a5746a59fc0b9eb112667fe22da3f6

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