Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdfb49e8f048222…

MALICIOUS

PDF

73.4 KB Created: 2021-05-11 05:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2d8e599c54d7a9483d5dd763fc6dc078 SHA-1: d31f7ae65ac4a20650fdd72aa64cc6c31f093f35 SHA-256: cfdfb49e8f0482223e6622e28dd530ec3d974d7e13dc3522d4025253a885b2a1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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://mezovuduw.ru/strik?utm_term=what+is+the+easa+list PDF link annotation
    • https://cdn.sqhk.co/lokiwejawe/eHzYmqz/96573209722.pdfIn PDF document text
    • http://vittorguxx.site/14477337573mvvp7.pdfIn PDF document text
    • http://topcreditreport.info/the_torah_codes_end_to_darkness_watch_onlinerwoq0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5fcc541e7852e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_604d3327c5a6b.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/BjgIHjj/pafasewakuvetaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5febb0e991cfe.pdfIn PDF document text
    • http://socialwave.me/welavigebexozzflh4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_cab932670d8a4fb38dc8f5b2ca85d296.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fa05a4-efc2-4d7e-b804-9f65df0aea88/navy_seals_movie_theme_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae37a576-214a-48bb-95ab-df995c708bb1/xijusa.pdfIn PDF document text
    • https://2fe0a9f4-4d23-48c4-8711-d5fb25093877.filesusr.com/ugd/683a75_420b205bc1cc4d09bc299122db2399d0.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_35c9412d046d4d4187b80b4d09fe5ef3.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_c5d6ac66bfcd4778be11a0ad60ace683.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4b51d9-dc8e-483c-a910-c3decd2546de/68888301615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f166c2-388a-4cb8-aac3-069bcd41b642/19280229287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebabb2ee-400e-416b-99e8-54f52477ef31/what_states_require_helmets_for_motorcycles.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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 4692 bytes
SHA-256: d81874036218b276d1750a62266ca770f125af10e32a00db1497c3db2636c75f
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10240 bytes
SHA-256: b4eff18c552eb572188a2b3d2f4812c82016120f8bee87b010a75af0546726b3

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