Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe6ec61e104809f…

MALICIOUS

PDF

120.9 KB Created: 2021-04-01 01:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d0419923390df850e23119b25e77c35a SHA-1: 3c48878efd5d2a04bf76827ed08e8e0b3dcafb0b SHA-256: 1fe6ec61e104809fd557c01ca07c47014b6bb836aba327c58afeb705b5b9a10d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and one specifically linked to a search query for educational answers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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://soxebez.ru/wix?keyword=addison+wesley+math+makes+sense+grade+8+answers PDF link annotation
    • http://brettlockhart.com/hojas_de_ruta_jorge_bucay8nyze.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/vaggCgf/growtopia_hack_download_apk.pdfIn PDF document text
    • http://reactivascotia2020.com/31292609332becay.pdfIn PDF document text
    • http://trokot-shopnew.online/zuvujowunimabakanuid986.pdfIn PDF document text
    • http://perfectiona.online/79999730731y3py4.pdfIn PDF document text
    • http://fastdonwload.space/parlour_x_reviewqge8n.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/bgjjjjr/impulse_response_function_var_python.pdfIn PDF document text
    • http://shtampshop.ru/cuando_es_el_mejor_momento_para_hacer_test_embarazoe398p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac24aaeb-5dfa-4517-baeb-ea5c8630c075/drive_mobility_scooter_battery_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcddaa7-f68f-4110-8da5-5cea37c98528/basemamumujugaxaxuref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0969eb8d-dddc-4e99-a201-8d666e298386/27210936203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58facfef-2921-4d35-ba32-0be9146c6f94/53307875106.pdfIn PDF document text
    • http://rejefuwozumij.rf.gd/newspaper_report_format_cbse_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9688e5f-351d-43ea-a8f5-90d389b4d47f/juvudokitipuriguguxa.pdfIn PDF document text
    • http://jufesibujubaji.rf.gd/nituralaxasexaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32470d6e-fa58-4b0d-a969-51148ad07d00/what_is_operational_projects.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_off00019dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DFA 5680 bytes
SHA-256: 3531c6ba13254fe2c5fcbdcf4e6e0fbb7acfea2b434004d1abd7461ad8ef178a
font_01_sfnt_off0001b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B136 10896 bytes
SHA-256: b6a0333e117422b50302e12d16310baac131f94eb7643dc953453d92e72a5a63

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