Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7e595dc76b233b…

MALICIOUS

PDF

73.2 KB Created: 2021-03-24 20:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 07a46cc0d92ed58ec4d880fc38b076fd SHA-1: 125a287307f13b46776215688fdb849df4e82741 SHA-256: df7e595dc76b233baaaf2e75effbd571cdcf8a64fc82c463d6c68b89a6e7fd42
66 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 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 0.9997

Heuristics 4

  • 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/123?utm_term=excel+compare+duplicates+two+sheets PDF link annotation
    • http://niluwipewuxasa.medianewsonline.com/baxunovogidubekigizo.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/where_to_buy_fleck_5600sxt.pdfIn PDF document text
    • http://respect-ltd.su/audacity_for_pc_getintopc4oo90.pdfIn PDF document text
    • http://fastpysystem.online/ps4_emulator_download_pc_version_3._2._13cpt8.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/visel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://givonomiruf.rf.gd/medical_terminology_textbook.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/ryobi_backpack_blower_carburetor_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4ee4d2-717b-4c5d-bb99-3af2fce8642f/relative_clauses_ppt_esl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e27660-a850-4ed1-aa5c-179bf77c33e9/lezonibigerofubuda.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/10678487658.pdfIn PDF document text
    • http://pisonepegosa.myartsonline.com/78705603323.pdfIn PDF document text
    • http://telisidaz.epizy.com/48113084300.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_1b556ee05cd040ec910973a228e2e2d4.pdf?index=trueIn PDF document text
    • http://sabozovitebem.rf.gd/15660825080.pdfIn PDF document text
    • http://lifinevedilubu.epizy.com/lehninger_biochemistry_book.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_57ae96f47ed84e448b4f5ee871fd8b1d.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_31c3eea0f1e043479d279b26d41c5bc4.pdf?index=trueIn PDF document text
    • http://zitilola.rf.gd/risal.pdfIn PDF document text
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_1b6a20cab55f4b4cb1ca45d8866b6fe6.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_ab26f38e757142f28010201e98d61da3.pdf?index=trueIn 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_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 5428 bytes
SHA-256: 2409ec80234dce090dee2fb45d7b1bb6e69c66fc29c5f10ef2820c54fe49b857
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10452 bytes
SHA-256: 658682686ff9d2c6701dc5804930cced78e9a356a0c4686229e6dc52f8314b51

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