Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a3f0880375b3ed…

MALICIOUS

PDF

92.3 KB Created: 2021-02-20 17:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4baeb622c118810ed81c40953149779c SHA-1: 4d087e8758500d6cef2c5c2b843225e6eafe675d SHA-256: e4a3f0880375b3edbf7b574dac0379c9642daf32e7ef9b52399383db03fd23c7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=lg+extravert+2+user+manual PDF link annotation
    • http://beststudent.fun/nojexemusezaxonakefunibd3n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_6007a0ac74cc3.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/6jciddA/radio_streaming_online_delta_fm_jakarta.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/ztbhigg/vezoboretikakawugunobuj.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/dmjazOf/10251682490.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/NhbsWig/kifuzedati.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/jidgiha/td_auto_finance_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/mBjdmhi/18808402004.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/0219f.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/WrgerwR/navazaxenusiwonujeremo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5fdf8fcba3df5.pdfIn PDF document text
    • http://reduslimitaly-official.website/dazowajoniduzesudoeaa1n.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/iahgibb/91736901804.pdfIn PDF document text
    • http://itanah.space/busosaxejurokatagadenif85tks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5fe9fc7fd120a.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/hggejFC/microsoft_launcher_for_android_4._4._2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/beethoven_piano_sonata_no._6_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/jarazutaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/21699472197.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/alberta_society_annual_return_form_reg_3185.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 4932 bytes
SHA-256: da8c7ed447abfa5f43aa19a054f00bd479f0c4771a1092d20c14b040e8c14d4a
font_01_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 10396 bytes
SHA-256: c6b9d19fa5c3f71fc766308bd3f081c2b379d4f99ed14d82d6bc7d33ac76c3f4
font_02_sfnt_off000155b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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