Malicious PDF — malware analysis report

Static analysis result for SHA-256 db590583301f38f3…

MALICIOUS

PDF

87.1 KB Created: 2021-05-22 04:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d4eeb710d7c8bcce4b6a35225132cd70 SHA-1: 7d69bbf5db1f9789bf1dac5cd9ac351806e36d3f SHA-256: db590583301f38f357b83b02ca01813fe315466f421d25dc3757d27f4cf4dcef
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a mass external link farm and a high ML score, indicating malicious intent. The embedded URLs suggest a phishing or SEO spam campaign, aiming to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself is weaponized to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=aiou+date+sheet+spring+2020+bed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5ff624abe3cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_602adcdf1b4ed.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/xotulobemiwafubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5ff5118f037b0.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/edb2f34dc6.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/6548324.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/viwulej_nububabikiw_lujakivajunar_bivela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5ff3ac3c961fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_601dbb9a2b7c9.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/c19770f92de.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/falejogajir/database_security_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/disbursement_form_meaning_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/ejemplo_de_guion_de_obra_de_teatro_infantil.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/chrome_for_android_4._4.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/lalodomixafunuzikelukut.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/sakesudupupelimikelegi.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/logical_thinking_process.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/92964641485.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/joe_turners_come_and_gone_act_2_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/bandos_guide_alora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec80b56d-af58-41c2-a8b4-2e9c8ff4202e/how_to_add_a_picture_to_a_background.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/2006_chevrolet_malibu_maxx_recalls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2ad3c7-3f4a-4277-bf5d-aca8d714ca09/64878550243.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/bijotupivilem.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_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 5592 bytes
SHA-256: cc3e1e7cb578549718d5a2541ce0d84b6e7cc4b0726fe22b9513d1bd02b5f06e
font_01_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 11472 bytes
SHA-256: a51546f65b8991be90ab3cd3d0fdafc8bf71deea9e2a9821a8bc88e3ab8a8e98

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