Malicious PDF — malware analysis report

Static analysis result for SHA-256 7354d2fb39d63e03…

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 04:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9620bf2ed006ff6b27d23c6ad5f7d18e SHA-1: 50afdde8a49d35d45e4dd7b6ed7d5166f8dedda9 SHA-256: 7354d2fb39d63e03a078e6a7a0e1a0b529a57abae32323123d86bcccbd509d32
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 0.9993

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.
  • 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=which+microwave+is+best+convection+or+grill PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416501/normal_6034fa95c1db6.pdfIn PDF document text
    • http://reduslim-official.website/tintin_film_netflixmutnr.pdfIn PDF document text
    • https://nozuresosobud.weebly.com/uploads/1/3/4/7/134758814/b4dec0bfefbc.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/kefuri.pdfIn PDF document text
    • http://world-wildshop.com/what_is_riba_al_fadl3z19g.pdfIn PDF document text
    • https://mubujibazakob.weebly.com/uploads/1/3/3/9/133986275/lamuwi-vupuwivivife-vafutelumibas.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/9704081.pdfIn PDF document text
    • https://divupamafotot.weebly.com/uploads/1/3/0/7/130739309/3478541.pdfIn PDF document text
    • http://ewop.space/62492710522jmyub.pdfIn PDF document text
    • http://netewe9.xyz/7-4_practice_similarity_in_right_triangles_form_k_answersrq62g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_602fd9ba8c96a.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/gebukil/dukejefedaxozofosebemom.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_df88af12fdb24e60b728828da3d2824e.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_eaab39b2bb2d439795f1298cc8592187.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d63e2cc-7691-43eb-9863-90ab8990bf78/vuterugusojinipuzawag.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/fire_stick_tv_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/9848526195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd844def-77c2-408d-8a6c-57fbb2f0fee7/boxabokokadatasum.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_3028ae47eccc4827a3252bd96c31da4c.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_97f4f6273d35493db23e0b5a13a39556.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88e9e8d-21c5-45cc-976f-6c429c9ce0b2/7015101340.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/77463774631.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_8643d7deb04b40c996b7aeb5e7439e1e.pdf?index=trueIn 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_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 5516 bytes
SHA-256: 1d843df8987ec922181aa4c6a251496057aead4b2346b9097d2a1d2e2a5e619e
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 11004 bytes
SHA-256: 30ecbfaab2bc1ef1aaa0d17853516ad05339a14a3a272636f310da0d51629e7a