Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8424d40bec74a8…

MALICIOUS

PDF

81.7 KB Created: 2021-03-11 10:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a4d4a90c9907fe0bd1552363a8626b56 SHA-1: de35c6fd2d156791eb03bc3d482197c14e6490df SHA-256: da8424d40bec74a8064a08f951d310f8d21349b45329038b4388f310ce00ee8f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a PDF link farm containing numerous external URLs, suggesting a phishing or content-serving lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://pelibifir.ru/123?utm_term=bird+call+apps+for+android PDF link annotation
    • http://jiteruruw.sportsontheweb.net/zasopego.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/HieIja4/62782347538.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/jdiacgd/photo_editor_software_reviews.pdfIn PDF document text
    • http://wusator.mygamesonline.org/what_does_strawman_document.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/YOSmcgj/59264119734.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/xMgcjTE/fashion_dress_up_games_y8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499635/normal_5fe5113033565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_602682d9e3ce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd18a831c307.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/higJRBo/1669638527.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/foundations_of_algorithms_5th_edition_solutions.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/bejikefowu/auditoria_informatica_ejemplo.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/sisumakarazatexuvegibito.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/55039632219.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_1c8dc1837a424a33b81e1b3a88175147.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/guzijesijun.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_fc333cd1ecf143de92eded6386efb1f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/age_of_empires_2_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/kuzudajotaxebep.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_a3c8fe5a43b54994baae8f0e34b3dd72.pdf?index=trueIn PDF document text
    • http://girofili.myartsonline.com/82076794416.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/ti_83_calculator_online_no.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/bailando_english_version_audio_song.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_1e789c80cc0f422691e5b7cfa04b994b.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_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 5200 bytes
SHA-256: 0d6615979db3aa0dec60786c323e14244d24432c7c80fcb08f9239d19fdacbd3
font_01_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 11552 bytes
SHA-256: 3d7cc9010fb46c83fa39271f0ba29d85120fdde553a246eb4e6ca874e74e080d

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