Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a1814be4caa669…

MALICIOUS

PDF

73.6 KB Created: 2021-03-31 14:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22c8802945873ea0fdf8adbab970cdd4 SHA-1: 2206af3e7cdb9637e272ad50423f1b8f1afbcab2 SHA-256: c3a1814be4caa6698b2a8b672c5e849202fdbb00bbc070e2ba9f05dc32f86f87
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, with a primary suspicious URL being 'https://baarspo.ru/wix?keyword=sin+city+comic+pdf+download'. The PDF structure and embedded links suggest a link farm designed to redirect users to potentially malicious content, masquerading as a download for 'Sin City comic pdf'. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=sin+city+comic+pdf+download PDF link annotation
    • http://sawedes.mywebcommunity.org/analytical_methods_in_vibrations_meirovitch.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/disadvantages_of_reading_aloud.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/wrought_aluminum_alloys.pdfIn PDF document text
    • http://obzorov.site/nikon_p510_firmwarek1og0.pdfIn PDF document text
    • http://weinmvc.net/how_to_reduce_business_property_taxsaeg1.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/arduino_or_raspberry_pi_for_home_automation.pdfIn PDF document text
    • http://uanews.website/zubalabasawipoluum5a.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/abecedario_en_ingles_para_colorear.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/17040333135.pdfIn PDF document text
    • http://lorenbayi.com/mode_one_approach42pmg.pdfIn PDF document text
    • http://poradoit1.site/lexukekewikaxojewiwiwqyt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/713a8fcf-d6de-4dac-bb16-f6e481394dac/49049652644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aae1e5c-4d2b-4269-98b1-0014c26e7f53/probability_and_statistics_exercises_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56fade5-8393-404e-9792-0b71143be27c/how_do_you_calculate_free_cash_flow_to_equity.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/votuxituku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa73763c-0838-424e-abef-c58c78fa9081/paduzon.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/wonukuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55eeaee1-1a21-4142-ac99-7d1dd59416c1/87846271126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0571c62b-eb45-4a58-9d69-fe60212c7796/joxajozevugodexenojujob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e732b30-507c-4595-8711-4fb3b9a24d4f/intuos_pro_pth-651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3979d4f2-bd28-43d8-b798-4d7634a24018/41981777528.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/candy_crush_soda_saga_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/579e1d0b-2e30-4814-b630-338e86085c9d/zufakupom.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/govuxegubedaxaranaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3decc7-38e6-4afa-8c87-fb5431fe82cf/grammaire_progressive_du_francais_niveau_debutant_free_download.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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 5324 bytes
SHA-256: a3ee016dfefadc00a2d8f501142a6ff36c4395549c745f3cc663bcea4a7aeceb
font_01_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 11480 bytes
SHA-256: 60190ec786bfb40548d91a2992a001cba51f64b42b972a5db63e5c2e5929d238

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