Malicious PDF — malware analysis report

Static analysis result for SHA-256 d910669479ed4db9…

MALICIOUS

PDF

162.2 KB Created: 2021-03-29 11:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fdb6174ff989be4fac8795cde1dfcf2f SHA-1: 9e10cd7d7ce69c2bad20a5d2f484387539e39ff7 SHA-256: d910669479ed4db94034ce6f7f3c0118a616f8d6f8ffd7b5fb5d4597d688e407
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 0.9995

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://seumenha.ru/award?keyword=album+historia+natural+jet+pdf PDF link annotation
    • http://my-credit.info/savings_tracker_worksheetymdsu.pdfIn PDF document text
    • http://dkmz2.club/64166819964xrn4g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5ffbd38e7bfbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_60393d30ee4e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_600dd187ebac6.pdfIn PDF document text
    • http://tonagruz.ru/43525460861xch0u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_603c56307f234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fcb1032e4c4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_601b7b4184b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_60229fbf798e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/509cb257-e50a-4ad4-a8dd-fa201865ae35/96440187933.pdfIn PDF document text
    • https://aaa8450b-5959-4376-bf95-5e5e4b45aab3.filesusr.com/ugd/bcfc74_e5fd7b4a69064976970ffe6a8e53389d.pdf?index=trueIn PDF document text
    • http://vavijirodujozi.rf.gd/review_novel_the_woman_in_cabin_10.pdfIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_0e4bc10b350a49549fcd0c85525721ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37cd38d-60bd-422e-8472-fb81b569f1a9/how_to_check_computer_history_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89967813-a364-4a80-9419-b61146b0a002/big_little_lies_tv_show_season_3.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_03a2354539984775a5a51435ffc31576.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_c0822900bee94a70914be36bc4c1d0ff.pdf?index=trueIn PDF document text
    • http://sonasekofuxix.rf.gd/cal_mol_to_cal_g.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_d362d5b90d774ac38746ff1a4745b9c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0cdf3b-b8c6-4351-b3a9-4493d028979b/pejuzikiv.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_off00023fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FA1 5484 bytes
SHA-256: a6508f11b79885556bb5ca9b1b36d8dec559b0bc394d5f04f4de2f9ed5cb4f1f
font_01_sfnt_off0002521a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2521A 12792 bytes
SHA-256: 7ac5ec0534905274db8131926afe939481e5a8362c0e65ee7ca5f55d56b21f4b

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