Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec7dd755156c822…

MALICIOUS

PDF

108.3 KB Created: 2021-03-29 20:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3b861b6b294892a8759451cd0a51a50d SHA-1: 908613641e1bad60f5aa25bc6c9f428ea44d8bcc SHA-256: 3ec7dd755156c822bc70c0e83dd94fd2698426d0e3a2e10de76c743d827524f9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/strik?utm_term=database+systems+the+complete+book+%25282nd+edition+ppt%2529 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416316/normal_5ffcfb54b1414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482406/normal_604fb88906d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_603df1fab9ef2.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/ruxujiza_wimaz_lizujaguxageb.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/61177755923.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/7361692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_603d0ece62a48.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/putizufasufowiwoz.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/linezirif.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/wejofujisavubemivupa.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/jezuduvurexul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/206b9cc5-455c-4fc4-8185-cb628e0dbd88/big_blue_party_speaker_pairing.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/fabezibidinudetivoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81102e44-fe5f-407e-8dc6-c51706966141/72832600969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8689b79-dc32-4cdc-be75-01d400012b11/jokedudarabokeze.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/56087952509.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/89469611953.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/radha_krishna_ke_bhajan_dj_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9940a3c6-e480-4890-86f3-d2a1c542c391/manual_de_gramatica_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0013cbdc-6621-40ea-b10e-ef5362bc2d72/how_much_do_ethical_hackers_earn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c21248-732f-485c-8e4b-9851da709aae/the_god_who_is_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7614e79f-c2bc-4bda-bb30-26d3d0cef88c/sebugi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/riluranu.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_off00016762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16762 5808 bytes
SHA-256: 167d143ca7daaef41250cf1e4cdd515f09677d6e14ba14841022c693d08b6e01
font_01_sfnt_off00017b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1A 11600 bytes
SHA-256: 605684fd317d71616f964e05492fc287c618f02b2b20c33fa259d8db20c6f388