Malicious PDF — malware analysis report

Static analysis result for SHA-256 a090a6f0ca900d86…

MALICIOUS

PDF

91.8 KB Created: 2021-03-16 20:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d4c9c64578bb1c8e05732b9bcf5251dc SHA-1: c450a1d292fd1db3c76564245ede450416b96f42 SHA-256: a090a6f0ca900d865e7f89ce61cea254d85d802c7c985e64531114977313a86a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to 'ue boom speaker not charging', suggesting a lure. The presence of numerous external URLs, many hosted on disposable domains, indicates a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

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://botokaw.ru/strik?utm_term=ue+boom+speaker+not+charging PDF link annotation
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/rozopabexatewit.pdfIn PDF document text
    • http://fogugevup.22web.org/the_best_exercise_for_lower_abs__fat_loss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fde6909896b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_603c075221e2f.pdfIn PDF document text
    • http://bixifofagowezi.22web.org/4th_grade_math_worksheets_decimals.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/how_much_money_do_indie_games_make.pdfIn PDF document text
    • https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/d84a9e5b7.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/kfNjchg/pirujo.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/65323462243.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/ecological_study_design.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/59728814770.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/giiaidA/6169615943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_600d82701dbcc.pdfIn PDF document text
    • https://vuxisiso.weebly.com/uploads/1/3/5/3/135321279/76a342757f69555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabukizazuse.epizy.com/dr_ambedkar_books_in_marathi.pdfIn PDF document text
    • http://pixagese.rf.gd/53165506092.pdfIn PDF document text
    • http://kokiralasido.epizy.com/41325343548.pdfIn PDF document text
    • http://wuxipuretox.rf.gd/convert_html_to_api.pdfIn PDF document text
    • http://zudobuzediret.rf.gd/ridgid_6_orbital_sander_parts.pdfIn PDF document text
    • http://ganusigesu.rf.gd/alluvial_gold_mining.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_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 5512 bytes
SHA-256: f833c85775d7767a2b5c7e2b6ced9365f30a42bbcc2ed996673a25a23914a6ef
font_01_sfnt_off00013838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13838 12280 bytes
SHA-256: ae2df0450f68070c77492c98611f0a997f8cb7e818b9e6a210700c6175fd0738

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