Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7bc9e2da38241e…

MALICIOUS

PDF

72.6 KB Created: 2021-03-08 20:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 67e1b9786cee67dd7d1be3a754b15cf8 SHA-1: 5698f13947ffb342bb8032b62dfa9b187b8d8d8c SHA-256: 8a7bc9e2da38241e0ddfd7fc77efad4d62027a8833c4e5c21c7b2e6f40c9d49e
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to printer errors, suggesting a lure to trick users into visiting the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/aws?utm_term=brother+2270dw+drum+error PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384154/normal_603a5019e50e1.pdfIn PDF document text
    • http://nizuloxodiza.iblogger.org/56447629372.pdfIn PDF document text
    • http://sugamipilafo.iblogger.org/tobekuzunifus.pdfIn PDF document text
    • http://bepifawajabe.iblogger.org/68808755167.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/engagement_invitation_card_template_hd.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/esl_worksheets_possessive_pronouns_and_adjectives.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5ffff6cbddfb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458838/normal_600138ebe4c27.pdfIn PDF document text
    • http://jetaxopavajuluw.22web.org/how_to_make_cornbread_like_famous_daves.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469135/normal_6005821add8de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443803/normal_5fe3bd422cd6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_601e3adb5d309.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/briggs_stratton_450_carburetor_adjustment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_602c9835b2f26.pdfIn PDF document text
    • http://xuxuvojetuzutej.iblogger.org/70s_suede_platform_ankle_boots.pdfIn PDF document text
    • http://kamodokawi.iblogger.org/junior_art_director_portfolio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_602145a567c1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petojijoxura.onlinewebshop.net/colonial_government_and_politics_comparison_chart.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/fisugizow.pdfIn PDF document text
    • http://xujogefup.rf.gd/chogada_tara_song_bestwap._link.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/sentry_safe_walmart_review.pdfIn PDF document text
    • http://jefiwimagi.epizy.com/shinchan_cartoon_episodes.pdfIn PDF document text
    • http://zefefudu.rf.gd/free_fonts_for_android_pie.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/64046172868.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 5140 bytes
SHA-256: fdfae227503d599a942b561441066e9787fd74983a1c219bab6608aa78cffe73
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 10128 bytes
SHA-256: 774e8c12a70939647ad49ebf221887ce8a3ca46b49e89fe9640f19cefc935c07

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