Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03c3301cb9390e4…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 19:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5247f8dcbbbbcf509ff47914f8128677 SHA-1: deeee286ed14d3b43d4e85b10adc873746d21911 SHA-256: a03c3301cb9390e4dc5e3c489dd786787357874a95966f721c70262cf9b9f402
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a search query, suggesting it's designed to redirect users to malicious websites. The presence of external URIs and a link farm heuristic further supports this, pointing towards a phishing or malware distribution scheme.

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://maypoin.ru/award?keyword=football+autobiographies+pdf+free
    • http://japarof.mywebcommunity.org/assessment_strategies_and_practices.pdf
    • http://fresh-ita.fun/virtual_table_tennis_hackjl0am.pdf
    • http://parkji5x.xyz/what_were_the_long_and_short_term_causes_of_ww2itzgz.pdf
    • http://mazers.fun/givonigukifo34n2a.pdf
    • http://evgeniy-semenenko.ru/sharp_lc-70le650u_reviewbl0n7.pdf
    • http://tufofol.medianewsonline.com/54088303493.pdf
    • http://pewujok.mypressonline.com/where_is_the_fuel_pump_shutoff_switch_located.pdf
    • http://tiktokfrance.fun/halo_swivel_sleeper_premiere_bassinest_-_lunagaxo2.pdf
    • http://xasumemazekejo.scienceontheweb.net/votikudominudamolajona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suruliloxapesas.myartsonline.com/tikakowad.pdf
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_c645a9b215ee48c2afc3f269241584ed.pdf?index=true
    • https://s3.amazonaws.com/tutasujal/ashampoo_burning_studio_16.pdf
    • http://tumezubix.epizy.com/physiology_of_respiration.pdf
    • https://s3.amazonaws.com/pogolo/baldur_s_gate_2_android_reddit.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_1b4e9436c2d64d909a7202749da569c1.pdf?index=true
    • http://jajogagek.atwebpages.com/how_to_calculate_number_of_working_days_in_excel.pdf
    • https://s3.amazonaws.com/mubemutolewe/58480532236.pdf
    • http://zelavejifokekoj.epizy.com/wawejotokesizaleviris.pdf
    • https://s3.amazonaws.com/davolazupivowi/wuwuxugarafim.pdf
    • http://tagijonegularol.myartsonline.com/nurizut.pdf
    • http://zajemoj.epizy.com/hp_laserjet_3015_driver_for_windows_7_64_bit_free_download.pdf
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_3c81629be6bf49cda38692df198371ab.pdf?index=true
    • http://nazowovemozugiv.myartsonline.com/komalogadaped.pdf
    • https://s3.amazonaws.com/rozebofukixus/chutkule_hd_video.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f1.bin
0e53a17110922b180bdeaed7853a070634066dba9d4f3ee8d003209d9d072f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5400 bytes
font_01_sfnt_off0000fb42.bin
aafb6049f3d314c9aa7abaa0beb071996278bbe2bbaf055e16f76532b3c436ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 10152 bytes

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