Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d401f69a95eb8a…

MALICIOUS

PDF

83.9 KB Created: 2021-04-08 13:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 891f7a00701fc7617a7a777d77aad424 SHA-1: ac5648890cd852e81d1b403f7f32f9b17724da06 SHA-256: 38d401f69a95eb8af81cfbe61e5ff83d63afc84d98099ff0dae9a2c253ef4ee0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of the malicious redirector suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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 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://dafemum.ru/strik?utm_term=la+mascara+de+la+muerte+roja+cuento In PDF document text
    • http://midutabumi.22web.org/74145593864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fd63cf502e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601ce16970d51.pdfIn PDF document text
    • http://xameruzi.iblogger.org/enlaces_quimicos_en_la_vida_cotidiana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd144386d6a1.pdfIn PDF document text
    • http://gidubanijokov.22web.org/5437563170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fcacca78182b.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/solubility_of_inorganic_compounds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_606e8af904373.pdfIn PDF document text
    • http://ludoviguboxulu.22web.org/vevakawasivitevetolatar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_60421a86ce172.pdfIn PDF document text
    • http://zogufovitem.22web.org/samsung_chrome_xe303c12_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_6021edfd17d9b.pdfIn PDF document text
    • http://jerikedora.iblogger.org/kureluguvinexedunanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_6052e877c39b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/how_to_get_a_knot_out_of_thread.pdfIn PDF document text
    • http://konevimojo.epizy.com/98926364031.pdfIn PDF document text
    • http://luwegovufa.epizy.com/macmillan_collocation_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/21693858795.pdfIn PDF document text
    • http://nugejumejopilok.rf.gd/java_decode_base64_string_to.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/oxford_word_skills_basic_audio.pdfIn PDF document text
    • http://zigevunagenape.epizy.com/arminius_vambery.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/collapse_toolbar_android_github.pdfIn PDF document text
    • http://fakodesugi.epizy.com/dovoniserori.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_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 5104 bytes
SHA-256: 30db98bcad9ad49465075cfe08fd560ea135f7f6370a91309d96faddb9d2815c
font_01_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 11924 bytes
SHA-256: 7ea189d3da0f7a856f422704aa218f76bae199850bd62778a98b6abf873d8260

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