Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62fbabc5fafc5dd…

MALICIOUS

PDF

83.3 KB Created: 2021-05-20 17:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b39e95ccf1ac6166fd84ae693e16dc03 SHA-1: 974941f8c47bef1cf30c66aad9930e9264b35787 SHA-256: a62fbabc5fafc5dd2ecd4baabc98424e7169b462dc49555112de44e36f8b79ac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://vilenefex.ru/strik?utm_term=you+don%2527t+know+js+this+%2526+object+prototypes+pdf+free+download PDF link annotation
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/3467072.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/rozadigajur-dorexegatiwus-gofekured.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/bexikefed.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/zilevezunamusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_605c60e8022a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_606e41959aadb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_60185ecb3950e.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/c958be9f-ada2-4ff3-8445-6e3ce8202c82/sirinotubumag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c06d5f8-c6df-44a6-9dee-4fff76c66d63/91184320831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db17bb8f-9126-4b17-bd12-8228d9a2cf64/95801508773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665faa07-826a-48d4-b1ca-67a0f775c8d2/32385595268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58aafd25-eae5-46f3-9d54-00ba118aeb8e/thrawn_series_canon.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/42131368834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67216d75-65e5-4fc3-8257-dc7f788554e9/words_that_start_with_zie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ea6b07-ce0c-496f-956a-0aae3ad6ca54/kabeposukiwesurivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45d59ce-466b-4f58-bca3-df1536842444/rabufurizalorakanesu.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/bandar_magarmach_ki_kahani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e04d1c-0583-4de9-84ed-b8aff3d4baa4/xivus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce0ee71-b513-4bc3-9eca-5f442c4b1b48/novation_launchkey_49_mk2_midi_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305710e5-7c08-472d-8ceb-edb3d074a250/ny_driver_permit_test_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5584cf-1026-49f0-adfc-61f3a77f69d7/zusofox.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/xodixoxebomoriti.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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 4564 bytes
SHA-256: 77bd4569617fee2a650c3677025ed380f20802b3482fea5687808d8db79fe6a3
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 13736 bytes
SHA-256: 943c43d0dcc44ee6d0baa7c6168ebc5b147b113d58fefdb49f22b16e33130912
font_02_sfnt_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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