Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f504bdfbd697695…

MALICIOUS

PDF

77.6 KB Created: 2021-05-20 22:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2981396018da895e32b52b8706a6e7f5 SHA-1: 9f61af83d65cf0e01c9c4b5ebb9fc4a86aec75ce SHA-256: 4f504bdfbd6976950b3f1dde0a589c37a3d4c4c8c717c01547508511b68900e1
96 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 0.9991

Heuristics 4

  • 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://maypoin.ru/strik?utm_term=will+my+face+recover+from+bell%2527s+palsy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381528/normal_5ff85ac4c04c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5fee038e42c28.pdfIn PDF document text
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/6419442.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/dagewepafokiloxek.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/ba6e56fc5.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/9278125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_6062a10d673a5.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/7564052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_6009db28a9734.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/laradusa/mitosis_vs_meiosis_worksheet_17.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/toefl_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/26853090862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3272022-aea5-4b1d-bd9e-559e7becdaa5/canon_remote_controller_tc-80n3_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/mechanical_drawing_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/best_free_calorie_counter_app_india.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/sewoniwanifufaxuletuwolos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a45fa4-2f91-4a1f-b68e-07984f5f40c6/68863512106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42167384-8d62-4b56-bbc9-37d625488936/fazato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57de3e59-f575-47d6-909e-2ecfbba216d0/suxuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f48d16-3885-4934-b6c1-52dcedd4ff2f/boy_scout_christmas_trees_evansville_indiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01806f00-3c45-41de-8728-9d8de988721e/harry_potter_book_one_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c443737a-c572-45da-944b-ded9abc480f0/tivomudodakumejivavi.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/ford_mustang_mach_1_1969_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/vw_service_department_stourbridge.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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 5512 bytes
SHA-256: 80a41f9b8a74ee8429b67677aac73bedd9a4837b4767fb82ce778d21609b1dc5
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 10320 bytes
SHA-256: 212310d931b05de9f687db72b6b2ae89a5e55080a336de4970bb20607e916beb

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