Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadb8489dbcd7e3e…

MALICIOUS

PDF

84.3 KB Created: 2021-05-27 14:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab358a556f019a4d32538101194297b5 SHA-1: b074e4d7cc8fcfe6f8994e2047b8dc0cb4d21148 SHA-256: cadb8489dbcd7e3ed103ba142fccca4c8f7ffd76736e086de562d1f67178d059
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 0.9997

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://bologen.ru/strik?utm_term=how+to+solve+3x3+cube+faster PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366359/normal_6010b6ef25bae.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/puvufinomevizib.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/9086960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_600efbc145d7e.pdfIn PDF document text
    • https://sedadiwetatu.weebly.com/uploads/1/3/7/5/137504668/tenivit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418199/normal_6002447ba4f8f.pdfIn PDF document text
    • https://felepakupanemof.weebly.com/uploads/1/3/4/4/134473623/bfe1f82ce52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_60558de2190e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_6068f0f501eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_601404774214e.pdfIn PDF document text
    • https://bubituzujolumet.weebly.com/uploads/1/3/4/6/134647672/2373738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_6059a38bc6a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_6032c22a9bad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469126/normal_5fed64e48e011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_60663a8c6564c.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/cab7263c-3252-4aec-9d3e-604bb9b71382/craftsman_laser_trac_skill_saw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b834bab8-1b80-433a-8eed-d133f6e5fbaf/stihl_chainsaw_011_avt_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0453022b-0756-497f-95b8-2d5c8e1e3344/fanuc_18t_programming_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f039f2d7-075b-4fa0-aa74-0afd614f1a24/82671421912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28766b0-a7f1-4711-83fd-3f5ed5cd6f31/housekeeping_marilynne_robinson_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b0ea99-b490-47f5-b227-66bb088f4097/bose_901_equalizer_manual.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_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 5360 bytes
SHA-256: 0ce45bd883bdb143b392a934a552b86152cdbc5411e2efb56e0f8d62d939a608
font_01_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 10648 bytes
SHA-256: 0e39ed1d5bd29f1578f5c6ac7164d96efcf7015f1306802d77c0b62ce7229160

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