Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f810c87ec22085…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 00:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 628a5dc9ac59e40b225551b8273829a0 SHA-1: a5d8ee1310b666a3e400b7d5a9ea9cb63558cefe SHA-256: 76f810c87ec22085d4b94db2fcf59740ee051215e9d9e321cc4c3282c1eccb6c
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to trick users into revealing sensitive information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://zajinet.ru/wb?keyword=amazon%20cloud%20computing%20tutorial%20pdf
    • http://kufafukedexepix.mygamesonline.org/89837674984.pdf
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/nujafurejirasefuworo.pdf
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/wenasovi.pdf
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/mururetubukidi_milamigeruvidu_wosuradanaka_xusajenuvedipez.pdf
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/xapitenuj-revaj.pdf
    • https://monotolifevi.weebly.com/uploads/1/3/4/6/134683372/xipes_tumiri_xexedu.pdf
    • http://sadinexiwa.mygamesonline.org/futifiwogopexunejejilobuk.pdf
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/sobefanatobarim.pdf
    • http://debuged.mywebcommunity.org/systematic_botany_of_flowering_plants.pdf
    • http://bukapim.mywebcommunity.org/sentence_structure_examples_for_grade_4.pdf
    • http://sollabs.xyz/rifujanoipj7h.pdf
    • http://bettyloustintruckbbq.com/gakixexedodafiwovokcrd22.pdf
    • http://xovuwowim.mypressonline.com/witaritifuse.pdf
    • http://jaxifas.getenjoyment.net/53174703936.pdf
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/07285456450daf.pdf
    • http://laketofetujeso.medianewsonline.com/quarterstaff_fighting.pdf
    • https://garuvopu.weebly.com/uploads/1/3/1/3/131398288/3810028f5b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://molagegivijoxu.onlinewebshop.net/84835626079.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f0.bin
eb8a1180a727ae6d48218ade54e732d9ce9e52aa4b518cfc22240ac723ba911c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 5336 bytes
font_01_sfnt_off00010906.bin
7b4986bb94a984ba393fe836f9fbbaa0cccabf1cbb8d47b16d76fc8ca3b31062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 11108 bytes

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