Malicious PDF — malware analysis report

Static analysis result for SHA-256 4417300c5ca25d49…

MALICIOUS

PDF

85.3 KB Created: 2021-05-22 14:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac27bc55e267195714b1492576740659 SHA-1: 1223b5d3fd1737094baeb176f640cc7e49b5ea84 SHA-256: 4417300c5ca25d49afa3cf4b7bfa2b72a036e98e159aad7971486a3b5c5139e6
186 Risk Score

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 0.9997

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://jacksth.ru/strik?utm_term=ios+13+launcher+mod+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5fc70e2e2290f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_6046f86c5a9be.pdfIn PDF document text
    • https://womolavexujixu.weebly.com/uploads/1/3/4/3/134350461/xamagosiwal-vonubiper.pdfIn PDF document text
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/5bfa77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_602b3e9213940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_60276c5414b6d.pdfIn PDF document text
    • https://zizujegaduxopur.weebly.com/uploads/1/3/5/9/135972979/fikemalejine.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/javikizilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366659/normal_5fcd3cc2d3f78.pdfIn PDF document text
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/7193561.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/bf01be4e-c1a6-4889-84e5-27fcf88b9f0a/how_to_record_accrued_income_in_accounting_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b59864-6982-4e45-adc1-885dd6ec533a/can_you_mix_pasta_dough_in_a_kitchenaid_mixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bdaa9e7-6c83-4fed-9067-16066228003c/48770703706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d04ffe9-1299-4bf8-a454-9405fc6b8e6f/annihilation_of_caste_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/calligraphy_fonts_a_to_z_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb04ae58-7009-444a-9b23-fe9d98f4c6df/bileribexevepobepenowi.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/free_engagement_invitation_templates_for_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/royal_mail_international_tracking_number_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32f97ae-8ed8-4773-86a7-101de1c8b343/how_to_view_google_cloud_storage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c01d49b-773d-4fff-809e-e94fe8a437ba/13388055016.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/rasexofetorifiluko.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/80437372970.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_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 5620 bytes
SHA-256: 0c873a7fd0d8f19dc265ee429b10e16d568ac934791a929286ebf5bf86fa6fa6
font_01_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 11276 bytes
SHA-256: bddbf856a0a3fb06613e8c4904dce93156848e05fc2f2e40b0f85c68d1d35b0b