Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bc81d483ef1943…

MALICIOUS

PDF

87.9 KB Created: 2021-05-19 23:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 386ccb60e79d85195d9a1084e56b95f9 SHA-1: bb39d040dc0ff702b5f309b3f6634e986d0fbed9 SHA-256: f3bc81d483ef1943a942cb244b8e5297ce379f054a82242d2ddaec83fd4d583f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://gimoguvi.ru/strik?utm_term=dunk+and+egg+stories, which is likely used to distribute further payloads or redirect users to phishing sites.

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 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.
  • 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/strik?utm_term=dunk+and+egg+stories PDF link annotation
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/6339290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fc8263443ee5.pdfIn PDF document text
    • https://metumarexidema.weebly.com/uploads/1/3/4/5/134591821/zetubaxazaseni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_6060215583837.pdfIn PDF document text
    • https://zitavuzan.weebly.com/uploads/1/3/1/3/131379524/f3400b45.pdfIn PDF document text
    • https://zekabijixakosu.weebly.com/uploads/1/3/0/8/130813896/rusalaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ffd1ccfd415c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tulosa/businessman_movie_telugu_full_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d84182-8691-4283-b77b-d82338e5e081/56117958034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca3da7c-3b21-4337-bed0-97f87fdcd0f5/petetuwotosasexed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1e3677-ab59-4da2-8144-b4a27beabf7c/how_long_do_hearing_aid_batteries_last.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/panchatantra_story_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c63684f-2448-4cf3-8d7f-0269b7cee6a3/36507583556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d47419-e9a5-44e9-a284-bcac69ba13cc/what_does_f20_mean_on_a_whirlpool_duet_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e2b36a-6835-48b2-ada3-3fb31ca2c394/59980680267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9cb67a-d8ee-4d3d-a077-34baa373913a/de_que_trata_la_novela_cien_aos_de_soledad_resumen_corto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49aaf3b-fca9-495d-b326-23fb726ccc38/sigma_bike_computer_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/ferezupobabowulumosi.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/drdo_ceptam_syllabus_for_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1e7980-2e8c-4505-b9d6-529f6063dd5f/how_can_you_describe_a_tree_dying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75531df-1961-48d2-8827-ee107aaba56d/youth_soccer_strength_training_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cc4011-12ea-40e8-b83e-547873abb0f4/dijimajifemu.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/carnivores_2_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6341941e-2378-4ab7-b840-7d78f49a0192/writing_effective_sentences_quizlet.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_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 5024 bytes
SHA-256: 4b2c2798669ebb06ca0c4e81547f69366345dfeaa726c8353244c7be7995245a
font_01_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 11100 bytes
SHA-256: 63a75e8567d7fd8f71f76b8c330e809e143c85970fa3f45e747f164f77d39cca