Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1e0f7b8ead4748…

MALICIOUS

PDF

75.0 KB Created: 2020-12-31 02:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 449ac3d300591870975c250b5069c285 SHA-1: 76f93ca8f810f86b1f83da63c3b57f6936fb177c SHA-256: db1e0f7b8ead47481592756e0da9df3e269322de7c6e922250b8c8ade1a5d497
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and a link farm points towards a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=krabat+full+movie+german PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477369/normal_5fecf6718e5a5.pdfIn PDF document text
    • https://xinejusitap.weebly.com/uploads/1/3/4/6/134630468/b61443042b95af4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fe2a4bc26751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_5fd28eb55fa0e.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/jshi0cH/fireman_ed_quits.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/wareg_xamar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fbbf69bee933.pdfIn PDF document text
    • https://mabamakozipapap.weebly.com/uploads/1/3/4/3/134315796/8a9d1b94.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/fimezojesuboxuz-sipaz-lezur-rufanafabukav.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/42efb3df793.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/B0Uhgjb/launch_schedule_vandenberg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5fc1baccd1b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f9c7fc4bb43c.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/925036cb-d722-4f7b-95e7-004efbec6d42/chain_reaction_movie_review.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_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 5080 bytes
SHA-256: 54858c8c5f5d7042f3800e08edfaa66c402f5bbe9a3e6513c038a8ff3cb9850e
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 11868 bytes
SHA-256: fc86a466265bfff6c73575017a4148111f62613ef6a4af8ea712bebbd2f5654f

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