Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d833db36211f76a…

MALICIOUS

PDF

103.1 KB Created: 2021-03-14 16:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d6634924f2e6d0ebdfb2d3c6b6327f8 SHA-1: 4e9cef050f413789a16844b706f805340c640061 SHA-256: 4d833db36211f76ae5c59560f25b4a3971cd5ec6f8de28c968181de5f91d0e0c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a 'bugaboo cameleon 3 manual pdf', which is then used in the malicious URL. The primary IOC is the malicious redirector URL.

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
  • 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://crophysi.ru/award?keyword=bugaboo+cameleon+3+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5fdbfbdec6463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_6037be002c335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_60312b7e3de61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501659/normal_5fcaf792d5be3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_600f5d7bad171.pdfIn PDF document text
    • http://msertis.xyz/la_vie_en_rose_chords_and_lyrics_english9t8j8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470029/normal_603b7c6395aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_603bf6d467333.pdfIn PDF document text
    • http://fefogumok.22web.org/64739610379.pdfIn PDF document text
    • http://trenketo.buzz/tasajinpz7v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475376/normal_5fe4501c39b46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_355dd44d27bd41bb80855aacf776bf09.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_66e6e52d69bc4909a203b93422a1d1e4.pdf?index=trueIn PDF document text
    • http://sejanaxopuvogiw.epizy.com/lobitagorikex.pdfIn PDF document text
    • http://madujiketowulat.rf.gd/67812243742.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/83773793368.pdfIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_e1872d822d76415e8c2b3158f12c616d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/rikafalaso.pdfIn PDF document text
    • http://xilagerezob.epizy.com/lifijelexarinazokuve.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_de80faa2e36a461b9bf7592de5079cfa.pdf?index=trueIn 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_off0001546c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546C 5556 bytes
SHA-256: 330fb3b5b8e04cb4d3dc44a0518b52f488c6a6845744c9e5e6fb06d5fc9dd6ad
font_01_sfnt_off0001674b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674B 11300 bytes
SHA-256: 943a4ab0e147ef5931d78eb0cb50aa8217b3efde2e9b0a8c8ac6c6fe4fd6f0b0

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