Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f94ec7ae96503…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 21:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eb5614c852cc9aa1bdbe0fc323a23154 SHA-1: 199f43253ca0a40d6a4bff757ce17823507e7d5b SHA-256: 1a0f94ec7ae96503347cd03e8c9e6d59591c8640b42cdf93415e694b309259dd
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 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 0.9996

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=things+that+start+with+ape PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421477/normal_600651f9ccfb6.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/TAgdiaQ/16717200723.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/moen_kitchen_faucet_repair_kitmlaod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5ffd86de699a5.pdfIn PDF document text
    • http://parkingtest.xyz/motiwutalabiwelisotaxibum31xfq.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hj8wieo/bloons_td_battles_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fc69ca39692e.pdfIn PDF document text
    • http://gooddevice-online.com/amma_kavithai_hd_images4y6v.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/vEibLN7/mod_do_hulk_para_minecraft_pe.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/tesodagiwor/zaduziwedowu.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_425e246b14404493bc6c0dd514f838d7.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_7f952026e7b04cda86276d307199f0cd.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_13712a7b1383486d83a1d37710c97701.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/clicker_heroes_guide_1._0e11.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_3b4e75d6f8154426be9be8d4bc1d42b4.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_1e5d2f23a1d948919c5cc16029bdd18a.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_f2bcc3def670425bb1c9b357f2480a88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/62736003711.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_d2263dbfeda64bdbae7f0cfefc16b38b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/barcode_scanner_icon.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_f0d555825e264cf8acac16bd58aea6c8.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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 5088 bytes
SHA-256: 79277c36b5dddf707416aae44932dfd59de1ef3c78b099bf232ea78bddbf5be4
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 11512 bytes
SHA-256: 1d461feb2e3e8130873a59db33c363cad538286ded10dcdb02ada027026fe9d9

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