Malicious PDF — malware analysis report

Static analysis result for SHA-256 c732cf11bda40081…

MALICIOUS

PDF

72.5 KB Created: 2021-03-23 19:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7151857cff4b71b5c5ff283add6c870f SHA-1: eb80d7b3d1c9bc664610559c359d163db8266a5d SHA-256: c732cf11bda40081a3334f60b5cd29e6f13683343cefd60565b181a5f60abbc6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment used to redirect users to potentially harmful websites.

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
  • 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.
  • 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://jumiwimov.ru/aws?utm_term=c+call+by+reference+using+pointers PDF link annotation
    • https://cdn.sqhk.co/kubabulukod/OKw8gg0/pin_removal_tool_o_reilly_s.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/giximikirovo_sibovifedajirap.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/test_for_alkaloids.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/gh8Bt3S/shark_ion_r76_vs_roomba_690.pdfIn PDF document text
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/vekigi.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/u7kpeia/tesenilijadabidikugodibup.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/d2vNdic/fast_and_furious_cars_iphone_wallpaper.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/cfe9b6d.pdfIn PDF document text
    • https://govalusazun.weebly.com/uploads/1/3/5/3/135325024/3749134.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/cCighg0/pixel_pill_widget_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/hegeClT/84665593070.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/ponadi_pisamis_tawefak_kedemunibota.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/iieha8d/john_gba_lite_how_to_use_file_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/auicjjX/63746508126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejegekobo.rf.gd/wevavizurami.pdfIn PDF document text
    • http://rubirabe.rf.gd/kingdom_hearts_3_walkthrough_guide.pdfIn PDF document text
    • http://nuvipapijulabu.epizy.com/6449952514.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_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 5328 bytes
SHA-256: 2d64e2b77405d4246b7acbf2a067ab3dbbad8b88f4dc96526c677d90bb485673
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 11256 bytes
SHA-256: addaa92a398f2d74cc5a74f5ebe3e9a5972658983ace20e6b0b2884fd9a1fef1

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