Malicious PDF — malware analysis report

Static analysis result for SHA-256 141ad6d34c72b85d…

MALICIOUS

PDF

70.7 KB Created: 2020-12-20 21:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 966e9aeb8e5ae64c8a1a3a9ec51410e8 SHA-1: 57ae948eef5282957a17d42b6ce4decd80cd5702 SHA-256: 141ad6d34c72b85d8451b981bfc08ccead850b5a527227455a9089b1d13f307a
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to redirect users to 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=hakumei+and+mikochi+hulu In PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/5834697.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/5242960.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/f313d.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/katuf.pdfIn PDF document text
    • https://wibagubid.weebly.com/uploads/1/3/4/3/134373733/lodokilunitet-seximenosatisi-subinu-kuxebofurok.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/rajobogupur_fupajaxaf_nodiwugev_bufilexisonovum.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/ea3f0106-58e8-45aa-b6fd-873953594ed3/9595704894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec11d44-66e7-403b-a4bd-e428a9abf6ea/64681906515.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5904aff13940aa25f39a7/t/5fccef71a87f9f1b19da1873/1607266161806/dune_buggy_kits.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe386b97992eb55c938e/t/5fc2cf6af81c9a2a0cff406f/1606602602712/95604128585.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13e7dd49dd12447366960/t/5fcff5ab9f9d2451fc87b4a2/1607464365645/balubezewofobalufuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560e6776-0b95-4b99-938a-d6e223e8867d/saudi_arabia_cities_by_population.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bc09e2-c542-420a-a0ea-e2f9ebdfa811/40803295135.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b1e1c89e1c4b8fc407cc/t/5fc772826beae4543166da6f/1606906502988/66935053736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7748a1-5e06-4915-83d2-ce458e171ff8/19273250298.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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 4928 bytes
SHA-256: 7410b180268126b480433d56ba52acff0a20d357d45c003f0039dba5ee20075c
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 10780 bytes
SHA-256: ace71722f750bc7be0b7886953fba880f0ac9faed7b42d444153e03a0ab1c7e5