Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34911c33e5b0bbc…

MALICIOUS

PDF

79.9 KB Created: 2021-05-13 21:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aed920686ed9a489dccb3918e40d3206 SHA-1: 4911360f4b1d4427795fadf655beed54ad080190 SHA-256: d34911c33e5b0bbca6650af78cb072d267cb9df506dbca4cb4f78d2fee378128
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains a title related to a political topic, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=can+congress+abolish+the+death+penalty PDF link annotation
    • https://sigurapefudaji.weebly.com/uploads/1/3/4/5/134576843/6694148.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/diario_escritores_de_la_libertad.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/1253656.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/wedabevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5ffa6c53b85d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_602fb2ff942f4.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/ijjYlig/fekipo.pdfIn PDF document text
    • http://sikazigazes.mypressonline.com/alimentos_transgenicos_unam.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/nepokabaga.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/djigfic/bulizapabodemudazamitob.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/post_cataract_surgery_care.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_605d5dca7f1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_605e0ce5df4d3.pdfIn PDF document text
    • http://rumagadoli.22web.org/comprehensive_chemistry_book_class_11.pdfIn PDF document text
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/podiramim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalosig.rf.gd/arrest_report_ada_county.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95771db5-d8f3-4c3c-b43b-0c1e95447b2a/vebedij.pdfIn PDF document text
    • http://bizosubage.rf.gd/dictionary_thesaurus_app_for_android_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf95c110-eca7-4701-a380-02dd449c9bd9/new_city_catechism_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c93b465-5291-4d69-9dbb-e1a9769d186b/72233138941.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/69294342612.pdfIn PDF document text
    • http://mazotuge.rf.gd/lovazozupexaxumitunaropa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bb63fa-6fbc-4f74-9266-dfb787e7c187/relion_blood_pressure_cuff_hem-741crel.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_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 5484 bytes
SHA-256: 46ae64ac4d69a440c8175efa7115144979f6a581c0555e653f4977f3d179939d
font_01_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 10556 bytes
SHA-256: ccf5d98243a291383f65f98f5865c4ecf1c9ec293bb8fd7cc540e9c5a09a5c96

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