Malicious PDF — malware analysis report

Static analysis result for SHA-256 284518e0343309fc…

MALICIOUS

PDF

84.7 KB Created: 2021-03-16 08:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e340957030842bf467602c2f6742bfd5 SHA-1: d6230c96cf8c31a233faff277e411388968333f7 SHA-256: 284518e0343309fc879a254914f17c3f5092a674535d8b5e8c5c5561194f7823
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://leonvi.ru/wix?keyword=civics+and+economics+eoc+review+packet+answers PDF link annotation
    • http://nakanilo.club/ravemovugepixuzogenkeek8.pdfIn PDF document text
    • http://vkrowl.com/my_talking_angela_hacker_apk5yxoy.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/6725039.pdfIn PDF document text
    • http://salet.store/frases_el_libro_tibetano_de_los_muertosm8d81.pdfIn PDF document text
    • http://freedate18.xyz/824450253354tzhy.pdfIn PDF document text
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/aaf8795.pdfIn PDF document text
    • http://plsale.pro/how_to_fix_lg_v20_screen_retentionb4kb5.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/vitajarudezulisalonelur532j.pdfIn PDF document text
    • http://gelchlen.fun/porukib0kye4.pdfIn PDF document text
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/dipenajibelid-xulezif-jokafedupomi-fosiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_0beb8f4e290a458791395c9e6b0223f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b93192-ea16-4329-86e2-f2ded396d1c0/digital_image_processing_rafael_c._gonzalez_ppt.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_5c27d471d63f42b094aaecdcdd540090.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_bb0c4e8b830c44a1a4f8e0a42fc7f06b.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_1548b43b888f40a8b5f81c804441ecf8.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_2135790cbe4b44c2af9e48423edc6c51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebecae98-a97c-4c91-a5ed-c9946b091e88/41694247004.pdfIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_9770532fbf9044cbaee4d4dddbc2e0b8.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_2ac95863ee0e450d9e1e6c1a520e3ffb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c853bea-c098-436b-b079-ae6a766cb97e/conair_hair_clippers_walmart_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9746e61c-eeeb-4f9d-850d-01cc4478ca0a/82558364687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b60244b-3a03-44eb-a84a-951ff02e758f/tc_renegade_54_cal_barrel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 5308 bytes
SHA-256: 378cf815327212152c2c2756b837ef855591dd80a7e2d8320a49ec40b02b5a36
font_01_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 11616 bytes
SHA-256: 8c231d8881ade66cd277b10c0bb08e3aa1ecb8ae3b4ca66d3fadc6891230263b
font_02_sfnt_off00012f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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