Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a63bcd506377f4c…

MALICIOUS

PDF

66.1 KB Created: 2021-04-11 07:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df6efc845545bc01459aca64cf1d85ef SHA-1: 7256c2a630e0bdd67d8e456e4a289544adf327b6 SHA-256: 1a63bcd506377f4c3ebfd9199bca29316cb79705566d37e639e7a5a1f52fe5ab
176 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript payload that likely redirects the user to a malicious website, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded script's primary function appears to be to facilitate the redirection to external URLs, such as the one found in the document body, which is a common tactic for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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://leonvi.ru/strik?utm_term=what+is+a+stoplight+switch PDF link annotation
    • https://kawolusasemosu.weebly.com/uploads/1/3/5/3/135397741/magarelorufuvib.pdfIn PDF document text
    • https://gefeteki.weebly.com/uploads/1/3/4/3/134310298/bea61d67db788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5fc87046f03e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_5ff1e68912e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483361/normal_5fe2c0057804e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fdd60de17d14.pdfIn PDF document text
    • https://fumitofid.weebly.com/uploads/1/3/1/6/131637255/73756.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/goals_of_punishment_essay.pdfIn PDF document text
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/dugusixujixanunuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_603eb76328b95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_6043e3dbac80b.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/resumen_del_mundo_de_sofia_capitulos.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/tufet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5ff6522777074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5fc5e5c51c30c.pdfIn PDF document text
    • https://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/ba0cbbee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_603e426817f77.pdfIn PDF document text
    • http://pesuzukotejoki.iblogger.org/life_of_olaudah_equiano.pdfIn PDF document text
    • http://detaxinema.22web.org/lajifubukefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://larujuzo.rf.gd/arabic_words_with_meaning.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/vamejemivaze.pdfIn PDF document text
    • http://sagolitoru.rf.gd/dizojisebigegobalik.pdfIn PDF document text
    • http://fikovik.epizy.com/gps_garmin_255w.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
embedded_pdf_script_0001008a.bin pdf-embedded-script PDF decompressed stream script payload at offset 0x1008A 67686 bytes
SHA-256: 2e1c0b16c9e7c4ccf1c02df1cc85c57359e40376c98ccfefd069aef94869fa2e
Preview script
First 1,000 lines of the extracted script
%PDF-1.4
1 0 obj
<<
/Title (�� W h a t   i s   a   s t o p l i g h t   s w i t c h)
/Creator (�� w k h t m l t o p d f   0 . 1 2 . 5)
/Producer (�� Q t   4 . 8 . 7)
/CreationDate (D:20210411073242+03'00')
>>
endobj
3 0 obj
<<
/Type /ExtGState
/SA true
/SM 0.02
/ca 1.0
/CA 1.0
/AIS false
/SMask /None>>
endobj
4 0 obj
[/Pattern /DeviceRGB]
endobj
6 0 obj
<<
/Type /XObject
/Subtype /Image
/Width 625
/Height 155
/BitsPerComponent 8
/ColorSpace /DeviceRGB
/Length 7 0 R
/Filter /DCTDecode
>>
stream
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... (truncated)
font_00_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 5204 bytes
SHA-256: beff9054480c93779c1d977289f9bed994b7e4faea477501e8fe506a4a68914a
font_01_sfnt_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 9356 bytes
SHA-256: 26174361801a2730678de4db92737916ed5866e1e53ce2b511b86806f50f5455