Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e958ac49c51627c…

MALICIOUS

PDF

73.2 KB Created: 2021-03-14 17:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4327fb35d9295e32ef4cea957b4dff0f SHA-1: c6cfa7440647a0e3b97b36fef01c8ccd31f1a72d SHA-256: 3e958ac49c51627c0677f8ae0caad06885612d39181c5dd2042fc177d4bdf7b0
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary malicious activity observed is the redirection to external URLs, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kuzutuzo.ru/wix?keyword=exponential+graph+worksheet+doc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421970/normal_603093ff9406f.pdfIn PDF document text
    • http://top-salez.site/imagine_dragons_thunder_lyrics_songofxt8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_5fdb89f5c96fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fcd2d4a8a38d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5ffc90b54ed57.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/how_to_calculate_change_in_working_capital_from_balance_sheet32d7h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_5fe0ec4b7da6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_60487006ebe4f.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/first_and_second_conditional_quizb1ic9.pdfIn PDF document text
    • http://1ux.site/how_to_use_stiebel_eltron_heater1anm9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_5fea2b1208f7b.pdfIn PDF document text
    • http://arthromedro.xyz/582963585623eaaq.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/novation_launchkey_49_mk3_keyboard_controller.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4dc318b2-e453-4596-a7d9-a609fef6ecf2/origami_box_sweet_paper.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/deductive_and_inductive_reasoning_in_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25729233-5603-4d1f-a3c6-abfe5daee830/29966136057.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/what_are_the_three_inventory_cost_flow_assumptions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8965962f-6792-4830-8624-96eaeac36876/he_comes_next_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e325d18-7722-4910-b766-63c23685b9d7/the_perfumed_garden_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296c88d1-c7ea-4003-a695-9ad8188de90d/74195381247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412bac1f-64ac-404f-ae48-1f0d543a3e77/zokewud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e43b643-1d37-47e2-80ff-f370a574b6ef/lopanazifumivikarit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa858e3-150e-4702-be9f-7c0e2eebf7ba/rugomesewoboxezasin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8b399e-278a-4e98-ac51-d51cd05c37ac/3.5_phb_feats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5612b3-8be7-49c0-9f74-af6ffc8fd7fa/74994450102.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 5304 bytes
SHA-256: e0668458f57bae5e40995bb5cbf5a3a4fe8f222b7027b3ae7c73045540ae6284
font_01_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 10316 bytes
SHA-256: fed9cb99fb52c8acafba8b5d4a9acff68acadaea5f82c9b1d1e448420a7dd51b
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3