Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf93be4a4c80fe1…

MALICIOUS

PDF

94.7 KB Created: 2021-04-03 21:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 823d6e6d697298fd95be5d0d09e17962 SHA-1: 52e8699bc74d398319a19625f8565a82e74f7542 SHA-256: fcf93be4a4c80fe1e7bd80c8ffe73c791d2258af9405f5cdab7078dd31da6b37
186 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 ClamAV and 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=bath+university+campus+map+pdf PDF link annotation
    • http://thefortykuti.com/zalavr1k4b.pdfIn PDF document text
    • http://aycotoro5.xyz/rt-n12_d1_specs6vld0.pdfIn PDF document text
    • https://mepopukivar.weebly.com/uploads/1/3/6/0/136083549/574625ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_602b522915939.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/5afd86194e240e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_5fe7c98f40b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_605d75b9b24dd.pdfIn PDF document text
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/55d1cc.pdfIn PDF document text
    • http://tophomework.space/tribles_beltsville_marylandwxx70.pdfIn PDF document text
    • https://gewolokumopez.weebly.com/uploads/1/3/0/8/130814623/viwuvir-jerururus.pdfIn PDF document text
    • https://daxuvinu.weebly.com/uploads/1/3/2/6/132695190/9770f49c205c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_095d51c2b07d42b4898f0f30d8351fac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fd7ddc-e2d8-421e-92d2-b44f855f8dc0/rpah_elimination_diet_food_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e714d77e-8dac-405b-86e7-5ad2b805933d/el_mundo_de_sofia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da00b3c6-827a-49fb-ba79-441aef2e667b/dell_precision_3520_battery_price.pdfIn PDF document text
    • http://wodijoparipo.rf.gd/86512319872.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_1621b378fdd749d790c76052e3608178.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46608e42-04a0-40f2-b875-1013a9e3e683/xevegejesor.pdfIn PDF document text
    • http://gawelemuxidon.epizy.com/new_york_moviescounter.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_36beabcd8acb483ba92f633035e2cded.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_off00013315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 5572 bytes
SHA-256: 2563b44f5a7a00da287109419d324e95dac6f18f87a88d7434f8ef1eacd3b22d
font_01_sfnt_off000145f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F2 11284 bytes
SHA-256: 18481c1a6e50076e6de4ea26ecfcc5c4bfd21c9f384073e72d471176cbd7fbca

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