Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f048b605c0d0d7…

MALICIOUS

PDF

61.0 KB Created: 2021-02-24 15:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bb72e2dcb3ec779bf7101ff7ce933488 SHA-1: eb18efd5579581b77663e96a4462562a0ead8586 SHA-256: a8f048b605c0d0d7296712f9474ee1183c878717d24230cfa917fcb331ad1d63
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=pcbs+in+the+last+frontier+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5fff23be5e476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415052/normal_5ffeb24cdd1bf.pdfIn PDF document text
    • http://rolevuses.iblogger.org/lajipobutenin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480744/normal_5ff3173f6ee67.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/como_trabalhar_no_consulado_brasileiro_nos_estados_unidos.pdfIn PDF document text
    • http://pazexorosit.iblogger.org/zivagulaxusiverixogizew.pdfIn PDF document text
    • http://jivopifavu.22web.org/acknowledgement_sample_for_project_report_for_college.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warodisomadux.epizy.com/unworthy_of_your_love_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/55491491804.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/tefogu.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/gedituvegux.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/cengage_learning_quiz_answers.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/96567314383.pdfIn PDF document text
    • http://vunowobaxab.epizy.com/63821790283.pdfIn PDF document text
    • http://kodeketabekem.epizy.com/gainsborough_trilock_omni_template.pdfIn PDF document text
    • http://gesulomesazisaj.epizy.com/zopagebinepolinefite.pdfIn PDF document text
    • http://maboduxivugiv.rf.gd/cartoon_photo_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/javascript_formdata_append.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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 5200 bytes
SHA-256: 9ebee981d647344cb2cd258b279cf000d136d7472df055ec6f7b0a86262cc362
font_01_sfnt_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 9544 bytes
SHA-256: b5cb5d490b3600eb901119dc7f027b6ca7eace51bfda2a964b09cb080cf17102

Open this report in the interactive analyzer, or submit your own file for analysis.