Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efe0c4491cd2ab0…

MALICIOUS

PDF

75.4 KB Created: 2021-02-27 17:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3e6a6206e6217b17b5af6c4dd451d623 SHA-1: 497bd8a1633f4087ac7c01de016a2d0291612e93 SHA-256: 9efe0c4491cd2ab040e947213810ac80866c6cbb4e99a00b58298664e1f57c75
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic firings for link farms suggest a campaign to drive traffic or deliver malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/award?keyword=how+to+add+answer+in+google+form+mcq PDF link annotation
    • http://pofuxubilet.sportsontheweb.net/kunufudexemi.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/8139182.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/igCVgj6/kung_fu_movies_david_carradine_full_episodes.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/fjeGNYs/toloremokuxuxutog.pdfIn PDF document text
    • https://cdn.sqhk.co/zeputefilu/geJpPii/pibavemotiboguvezujezo.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/27262402313.pdfIn PDF document text
    • https://vakilelem.weebly.com/uploads/1/3/1/3/131379598/934dfdd33.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/rain_school_printable_text.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/nilerus_donuzedovob_zemalugosune.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/nuluwavewej.pdfIn PDF document text
    • https://vavuxajibibugu.weebly.com/uploads/1/3/4/4/134472661/demunexinafake_botimurumobik_romivaxi.pdfIn PDF document text
    • http://desoneveru.iblogger.org/big_mouth_book_report.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/tafubopasadi_fofaz_fomegul_pexof.pdfIn PDF document text
    • https://bewabolome.weebly.com/uploads/1/3/5/3/135347927/6269948.pdfIn PDF document text
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/tapajadi.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/fEXgcjd/planetary_nebula_definition_scientific.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/dukavunivifa/levofituba.pdfIn PDF document text
    • http://luwekexopevom.rf.gd/boohoo_stock_performance.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/they_say_i_say_4th_edition_free.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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 5520 bytes
SHA-256: 95a5a7b2fe0104ba949ca36a686c0bb512dd27a5862447b7868124a17f94fd1b
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 10828 bytes
SHA-256: 57e76c6ba6e50e20117d64c13ac19096a6b7235f9df630f62e125895e7627ef1

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