Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2877f79f89537ed…

MALICIOUS

PDF

84.6 KB Created: 2021-04-07 06:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 514e4292c915066404a5aa8ab0bfd6dc SHA-1: 92e17caed70da90acd992e3ef3c8c0baccd245be SHA-256: f2877f79f89537ed3c4307b5e5e935681c2a3d7c899aefa786d46b97e3ff7b98
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a network of sites for SEO manipulation or to serve further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=define+social+media+pdf
    • http://dikagowoxi.sportsontheweb.net/vabakojixukegin.pdf
    • https://cdn.sqhk.co/ledodatefu/dhfgfif/set_live_wallpaper_lock_screen_s7.pdf
    • https://cdn.sqhk.co/vowibesep/hfYOjdV/fejisubi.pdf
    • http://tagaporigowekis.mygamesonline.org/past_simple_vs_present_perfect_continuous_exercises.pdf
    • http://miraluvofizobe.medianewsonline.com/77229419312.pdf
    • http://fufetaka.iblogger.org/lanyard_template_size.pdf
    • https://cdn.sqhk.co/xizowabik/AhfifGi/24110119774.pdf
    • https://cdn.sqhk.co/wuwosexed/a2hhgg9/perfect_slices_mod_apk_ios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zakexukosogu.atwebpages.com/4th_grade_math_lesson_plans.pdf
    • http://tefepibitu.rf.gd/zadixidujemikixag.pdf
    • http://xekapakifujekem.onlinewebshop.net/seismic_data_analysis_techniques_in_hydrocarbon_exploration.pdf
    • http://dexadusoxeb.atwebpages.com/will_there_be_a_5th_book_in_the_red_queen_series.pdf
    • http://nosigegu.onlinewebshop.net/10206092212.pdf
    • https://uploads.strikinglycdn.com/files/5cf32932-dcb2-4dc1-ab86-e334e65c5f18/michigan_legal_help_child_support.pdf
    • http://faxiruvud.myartsonline.com/statistical_mechanics_mcquarrie_free_download.pdf
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_63c8aeabcf354ea6a9d2b90e09252d63.pdf?index=true
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_f85ae87bc8c24b34a03410bf09a2c9fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38347334-9ebb-4db3-8ae5-fdec619f8b27/xapoperisozitunaxug.pdf
    • http://vewokepewaki.epizy.com/26981184685.pdf
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_3b20989ab428451a8067f0c3ea34aa43.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50b.bin
718a63af7a8dd1577835b6f9f3e8839c42584c2cd822089565509b59f0e89aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 5204 bytes
font_01_sfnt_off000106c2.bin
885e5f84c257f7342ead1c538bd79a3bd53561d44c910ffdb4e5afb5358a3170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11528 bytes
font_02_sfnt_off00012e14.bin
ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16344 bytes

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