Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a392039872993e…

MALICIOUS

PDF

84.3 KB Created: 2021-04-23 17:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c4dda5c65da150b59e39ff7f4785d0 SHA-1: 731c7dc69e45a1fd076204bbc051861174289a57 SHA-256: e4a392039872993e1079f31083fc6a2ea8868d97bfa00748ec2bd56e191873d9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs point to suspicious domains, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=los+renglones+torcidos+de+dios+pdf+completo
    • http://xagakojitogiva.getenjoyment.net/83306995702.pdf
    • http://cethq.xyz/attack_on_titan_psp_game_for_androidfs6c1.pdf
    • http://wisecredit.info/police_charge_sheet_formatz11pn.pdf
    • http://dutov.org/65956124576f44c4.pdf
    • http://form-lnstagramverificationbadge.com/essential_mathematics_for_economics_and_business_teresa_bradley_download9uwz7.pdf
    • http://rasazajafatirek.mypressonline.com/vapibuzu.pdf
    • http://dusibarupuguli.medianewsonline.com/company_recommendation_letter.pdf
    • http://proita.fun/left_handed_bass_guitar_scaleskabns.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pisedij/mental_health_recovery_star_australia.pdf
    • https://s3.amazonaws.com/rimepusox/bf_application_form.pdf
    • https://s3.amazonaws.com/firigugixujotov/reset_tcp_ip_stack_mac_os_x.pdf
    • https://s3.amazonaws.com/vapelurowar/12094006738.pdf
    • https://s3.amazonaws.com/vovopafubipu/41984518466.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_c5ef2822d934493f9ea0fe73b1db0869.pdf?index=true
    • https://s3.amazonaws.com/supefujoxopubu/23759318402.pdf
    • https://s3.amazonaws.com/rexogeguxosix/airnet_ii_510_xr_manual.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_4e732492eabc4923b321e57d97a083a3.pdf?index=true
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_bea20f4a32a246b985ebdb814100b72e.pdf?index=true
    • http://futakanawus.onlinewebshop.net/17617855755.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_89dc5c5cf8984652b3429e7b31e6b612.pdf?index=true
    • https://s3.amazonaws.com/fosawef/44679211292.pdf
    • https://s3.amazonaws.com/mejigavukolu/94168348226.pdf
    • https://s3.amazonaws.com/fadobirak/32306464123.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/23450114715.pdf
    • https://s3.amazonaws.com/tozaduliwubega/nogelomedug.pdf
    • https://s3.amazonaws.com/jijari/updated_treatment_guidelines_for_c_difficile_infection.pdf
    • https://s3.amazonaws.com/jarirotexab/anarkali_disco_chali_video_song.pdf
    • https://s3.amazonaws.com/mivokozibu/l_accouchement_dystocique.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_off00010ad4.bin
3b8d54120abb1ab6f246d324c71349b4b0460441b4528c49f9b6cc55f988b167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 5204 bytes
font_01_sfnt_off00011c80.bin
4fb4cb5097c7e16c0516438eea480f98cdfec5347bfc47ccfa912496deb89395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 11700 bytes

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