Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe1c1211bbbd3e5…

MALICIOUS

PDF

89.5 KB Created: 2021-02-01 22:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c12bd7eba993d3212e516a17b56f61c4 SHA-1: be2fe43a59e08a17892fa75621ca823af1171c7f SHA-256: 9fe1c1211bbbd3e5c7049f84dc9fcb165cd64ce632adaf48fb947a960a780fb8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, indicating it was likely generated programmatically to serve as a 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 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://druttle.ru/123?utm_term=wreck+it+ralph+bad+guy+quote PDF link annotation
    • http://help-feedback-amzn6.xyz/osu_hidden_skin6o04l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5feb4b4e4c029.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/hngglU5/jazaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_6013ea000b806.pdfIn PDF document text
    • http://wide-mean.top/do_you_underline_poem_titleshiykv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_5ff30fc458727.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/iE8kggq/81789369982.pdfIn PDF document text
    • http://maroron.22web.org/jumokerudawedukokitik.pdfIn PDF document text
    • http://vivabozuna.iblogger.org/double_flannelette_sheets_nz.pdfIn PDF document text
    • http://naturapple.space/jetupoxamavijunodudujux7b2m.pdfIn PDF document text
    • http://submonster.xyz/75007682326fnggv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopumupukerodu.epizy.com/agneepath_deva_shree_ganesha_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/zediwuxabojixenel.pdfIn PDF document text
    • http://dobejul.epizy.com/40652752563.pdfIn PDF document text
    • http://segalemu.epizy.com/zarchiver_for_pc_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/adobe_acrobat_reader_apk_para_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/fowarojopujosikoreg.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_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 5604 bytes
SHA-256: abb424a7ac77109e7b9d5ee670f96341755bae6aa79dd52df19c0d99ee7915e5
font_01_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 10844 bytes
SHA-256: f4dbe30459e405eaafb0dfd893405cdba231d047dfabd5fe9c49da98c57f8215

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