Malicious PDF — malware analysis report

Static analysis result for SHA-256 4021d4f033c2ccf3…

MALICIOUS

PDF

80.2 KB Created: 2021-03-18 15:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 096b872c0d0cd9449a532da4928eacfc SHA-1: 29c6ac4357e0a2571e9f015a5dce7799125f42c8 SHA-256: 4021d4f033c2ccf39af507a634d5cc0095bd8be9ef046161fd1a5aaaa8a180c1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the redirection of users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=input+type+file+pdf+only PDF link annotation
    • http://wumewil.sportsontheweb.net/what_is_the_percent_composition_of_carbon_c_in_benzene_c6h6.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/building_collapse_in_new_orleans_address.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/azotemia_e_uremia.pdfIn PDF document text
    • http://gupodorap.iblogger.org/720p_hd_camera_eyewear_manual.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/wesurugotofilinameduj.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/80_meter_delta_loop_antenna_design.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/what_is_the_percentage_of_food_waste.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/gutikenufisigunesugi.pdfIn PDF document text
    • http://vivunijasu.22web.org/triton_ii_tr60_sand_filter_manual.pdfIn PDF document text
    • http://jefuvodavi.iblogger.org/88292261334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zodofujeki.atwebpages.com/bisacodyl_suppository_davis.pdfIn PDF document text
    • http://zusodufibixabut.rf.gd/bookmarks_android_chrome_sync.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_517532914eb44d91a4bd69a25211b0ab.pdf?index=trueIn PDF document text
    • http://begokev.epizy.com/how_to_fax_brother_fax_575.pdfIn PDF document text
    • http://sozizuw.rf.gd/al_quran_karim.pdfIn PDF document text
    • http://sidimusi.rf.gd/javujukojapijemusuzenuk.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_6673900aff7042888513c46101c512dd.pdf?index=trueIn PDF document text
    • http://nutimuratibuzur.epizy.com/metojaniwelomasu.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_06ea79b7454f4cb1b93c2bbaa10c7928.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_c70413ec6d674beda653cd500f4fb678.pdf?index=trueIn PDF document text
    • http://pamiwumewamem.epizy.com/best_mig_welder_for_the_money_australia.pdfIn PDF document text
    • http://bofidimasep.rf.gd/totuli.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_21139bf4b62a4e0ca5f7297fc6a79648.pdf?index=trueIn 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_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 4588 bytes
SHA-256: e217f3013d33d58b8838d0ba2a742934a5d791067d5127c38c54b2f200ac02f4
font_01_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 11496 bytes
SHA-256: 0bd0c27053e1ae4f792af6641e68981d8f1a8c2f4fe11a81c32eacbb3bb0283d

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