Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c24e08d932cc11b…

MALICIOUS

PDF

70.7 KB Created: 2021-05-30 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eb0acc8656aa069c36881d4599aaeb69 SHA-1: f154b2b680c36c151c796a68e2604687336ff3e4 SHA-256: 6c24e08d932cc11b8e2b83001248538a6086c9d6afcb4a5fd931d5f2a8ba31b6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The embedded content, though heavily obfuscated, suggests it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+are+the+advantages+of+cupping PDF link annotation
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/4cf0296bef240a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_604ad8292b8b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402706/normal_5ff92cdf61724.pdfIn PDF document text
    • https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/44e5a22d.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/5332617.pdfIn PDF document text
    • https://vekadewozume.weebly.com/uploads/1/3/0/9/130969331/46fd2d6c4743e3.pdfIn PDF document text
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/34295fa32b.pdfIn PDF document text
    • https://nisofopirumo.weebly.com/uploads/1/3/4/4/134478351/b6ec34ceff15f.pdfIn PDF document text
    • https://dibodowe.weebly.com/uploads/1/3/4/6/134686502/8906259.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/nagunumuj-nekasimotid-muwekamovena-ginuzasisarin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_60200d120e9eb.pdfIn PDF document text
    • https://gaviwejijeto.weebly.com/uploads/1/3/3/9/133997776/fufevezugewumax-zesobo.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/b21c024f-8a5a-4e21-8b11-3ecd6fc5f739/42363065247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fde7f8a-1798-41b8-ba6b-c158023a54d8/muwapelibed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5cca83-5722-4b20-89eb-5679119e92e8/kovisipigagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bd6d37-637f-40f3-9cab-1b6897d896c2/dork_diaries_14_read_online_free_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7f6a03-127d-442c-9e54-071d6e10584f/learn_small_english_words_with_tamil_meaning.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_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 5460 bytes
SHA-256: 1f94368f15b35c676362b34cc6c5e7e806cb0c8524066768968535d0ec5394f7
font_01_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10840 bytes
SHA-256: 01cadf5954558de3a15a821c2e3b3287ca2260bddedb6df0736e6803601eecfa

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