Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5b5aab63e63e13…

MALICIOUS

PDF

79.1 KB Created: 2021-03-21 03:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c39648f204ed903b7affc1cb3a7d34c3 SHA-1: 769c7459a4fb35853a1e12e0472abf5f76e47d10 SHA-256: 9a5b5aab63e63e13666ccb72f872df2e240c02e7fb5aa872912c3887cbfaf2a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of external URIs and the overall structure strongly suggest it's part of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=core+technology+definition
    • http://rajukilodagoje.mygamesonline.org/barron_s_toeic_600_words.pdf
    • https://cdn-cms.f-static.net/uploads/4392862/normal_60493d8ca45bf.pdf
    • http://rejamar.sportsontheweb.net/trastornos_alimenticios_en_los_adolescentes.pdf
    • https://static.s123-cdn-static.com/uploads/4478685/normal_5ff151262d14b.pdf
    • https://cdn-cms.f-static.net/uploads/4385415/normal_604a97b1f37f1.pdf
    • http://fibiver.mygamesonline.org/xemonemetufikatoxovuxo.pdf
    • http://ylyn.ru/17812288646tlpd0.pdf
    • https://cdn-cms.f-static.net/uploads/4414336/normal_604867f69bf8b.pdf
    • http://xuxetosufuzo.getenjoyment.net/acido_fosforico_formula_di_struttura.pdf
    • https://cdn-cms.f-static.net/uploads/4501229/normal_5fe9b7cea11ab.pdf
    • http://rawenspant.online/532762313032qpt7.pdf
    • https://levufaki.weebly.com/uploads/1/3/4/7/134743196/luretakeridenen.pdf
    • https://kilazazemuvazu.weebly.com/uploads/1/3/1/4/131452741/3512836.pdf
    • http://bizifemodefi.mygamesonline.org/nijiserabefuba.pdf
    • http://virona.org/fupozegulobulikavu2b98p.pdf
    • http://kifejuja.medianewsonline.com/fejidumupokugebi.pdf
    • http://tokesuditetu.getenjoyment.net/python_dictionary_contains_duplicate_keys.pdf
    • http://farozemirig.scienceontheweb.net/joxelesawupefabo.pdf
    • http://fukerijinexin.mygamesonline.org/alkalize_or_die_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/paxuvagal/nibujosewebewenezepamuzek.pdf
    • https://s3.amazonaws.com/gasodamuza/anniversary_logo_vector_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e915.bin
2b0ecbc4179e18f8edf2aa0777f8423a06e083462440aba4248643567cf9c557		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 4808 bytes
font_01_sfnt_off0000f96f.bin
6a70973c9c6b5e3f30629b6cab21fa910a4dc90490bfcae7b55e16ac6981dded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 11636 bytes
font_02_sfnt_off000120a3.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 4324 bytes

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