Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be4b36655d50d2a…

MALICIOUS

PDF

85.4 KB Created: 2021-03-26 07:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a741e789c05dd94433cce2d95b15b34f SHA-1: 2477ffd1fb6bbe3cabb0e8c851511c34797496ad SHA-256: 5be4b36655d50d2a371b69ea457a34467b3e54adca8dad5080910debee131f9d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://gimoguvi.ru/strik?utm_term=dnd+5e+homebrew+firearms PDF link annotation
    • http://afracheat6.xyz/hp_ultraslim_dock_2013_docking_station_d9y32aa_compatibilityzq3bn.pdfIn PDF document text
    • http://frankiearvelo.com/how_to_use_the_lincraft_knitting_machine4lp5t.pdfIn PDF document text
    • http://leoidet.xyz/7385357024482zh2.pdfIn PDF document text
    • http://soinjaga.ru/descale_keurig_2.0_using_vinegarnczjn.pdfIn PDF document text
    • http://zaxofebejip.66ghz.com/28570878787.pdfIn PDF document text
    • http://bonboxstudio.com/11685665781l6256.pdfIn PDF document text
    • http://emirofficialzm.com/what_is_uconnect_ramn06sb.pdfIn PDF document text
    • http://madewithsunshine.com/free_printable_birthday_cards_onlinezu92s.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://s3.amazonaws.com/gomakobez/kokexekovapubes.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/32861669309.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/cuisinart_juice_extractor_cje-500a.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_98b0f33d25e84b86bd4269b48b88148e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/258f0b8c-7401-43fd-8b41-128e8e1ec67f/federalist_no_73_summary.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_0eb4862d4f8f41f1b33bfbb93f04b887.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c396e72-34b8-4626-963b-fcec72be3103/drawing_linear_graphs_ks3_tes.pdfIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_b83ee85d32264424a2a8c159fe3a2aee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f010b6-cfd1-433c-98b9-17731d5e9ac7/common_core_state_standards_hawaii.pdfIn PDF document text
    • http://tosalovubel.epizy.com/40885173501.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_d0274d8119a84a2bb7ce010176e27afa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ee11d8-db57-4942-a0ae-007ba0c0917b/whats_another_word_for_violently.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a8ea6d-9d89-4c4a-b65c-5f1627f8410e/69556992488.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_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 5176 bytes
SHA-256: 67ceec30691da7aabdd5f17f1c3995a5f1d9671ed8974d1872b2d3970d9a884d
font_01_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 11320 bytes
SHA-256: eaf802896acf33320b0c1d6b6883e493689cc94606d3e5e080dcb805d72899e5
font_02_sfnt_off00013a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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