Malicious PDF — malware analysis report

Static analysis result for SHA-256 f868fba888f683e6…

MALICIOUS

PDF

80.0 KB Created: 2021-05-11 01:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d2a5f26e0ce4d256752700cafc079af6 SHA-1: 707e2c024df0a678b3a46e7f039ca999f7476313 SHA-256: f868fba888f683e658457f4540035c722c6dde330a05bb4602c4582a9894c773
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for malicious purposes. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=how+to+become+a+resume+writer+on+linkedin PDF link annotation
    • https://cdn.sqhk.co/xivovido/gjuYlYP/tm_prepaid_internet_promos_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jivizedu/fzhdP2d/precalculus_graphing_polynomials_worksheet.pdfIn PDF document text
    • http://fakutuzogazu.sportsontheweb.net/oral_candidiasis_adalah.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/kill_team_cassius_rules_8thn3jvj.pdfIn PDF document text
    • http://timelessdecorum.com/layers_of_fear_junji_ito4w56l.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/design_of_concrete_structures_by_nilson_darwin_and_dolan.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/33410648930.pdfIn PDF document text
    • https://cdn.sqhk.co/jajejige/jhtOPhi/39867570747.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/classification_of_algae_by_lee_2020.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/spivak_solutions_calculus_manifolds.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/fogibowax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_749c31f7f03d42d0b1cc9a65cca8250c.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_c86e0f19f7b149f08182563d4539c2b7.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_234cc6ed9bcc4f33a32b6f005dfcde2b.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_5f1e46aa5abe4d7d94fda68a1a062f99.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_3ccdd15681d64b4f963a1df42e541824.pdf?index=trueIn PDF document text
    • http://bigamutalunu.atwebpages.com/modern_standard_arabic_course.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_9bf05bb2b24a40cdb9726961c82f5d19.pdf?index=trueIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_c4a87c8b8ac74fb096a79926dc1ced14.pdf?index=trueIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/winkler_method_dissolved_oxygen.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_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 5344 bytes
SHA-256: c2d81d754f2b91501a755f8fc725a179b499dfb23165ca01b0636c179c4db5ae
font_01_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 11492 bytes
SHA-256: 9f1227b4ac4b7b16a01fb5ce7382e6bb4356fb1cac98c99983383d4598ca73a4

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