Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bbb75107caa689…

MALICIOUS

PDF

81.9 KB Created: 2021-02-07 07:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 20cbb2f02ffac0360731a7e77396aeca SHA-1: 916f98b803398142a38648458498eeaab853cdb4 SHA-256: 51bbb75107caa689e09aef3cf6d4bf81b190395bf1e0988a15baa869e1d44bf2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in phishing or to distribute further malware. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a large number of links hosted on disposable domains, suggesting malicious intent. ClamAV also detected this as a phishing trojan. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://baarspo.ru/123?utm_term=emoji+stream+deutsch PDF link annotation
    • http://raftgjgr.space/national_geographic_kids_magazinepcv9b.pdfIn PDF document text
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/sonobotejipen.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/fujojike-dagol-xurerewugutig.pdfIn PDF document text
    • http://mifetuvoge.22web.org/kinds_of_volcanic_eruptions_worksheet_answers.pdfIn PDF document text
    • http://axacheat4.xyz/climber_custom_report_in_qlik_sensezyqoa.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/mumeruriso.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/6163921.pdfIn PDF document text
    • https://zuzumesagodufen.weebly.com/uploads/1/3/2/6/132695194/33acd8b85ffef3.pdfIn PDF document text
    • http://dibuxovowo.iblogger.org/battletech_guide_mechs.pdfIn PDF document text
    • http://nevezewikuzi.iblogger.org/budesonida_con_formoterol_dosis.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/kibonuxi-sidetakonajebul.pdfIn PDF document text
    • http://infokurs.design/jenumizarerobkc6x0.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/e4d9521e41.pdfIn PDF document text
    • http://vojidovalo.iblogger.org/rejigugiwatujed.pdfIn PDF document text
    • http://milanomodaitaly.site/62656216841ll3i4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajivuselome.epizy.com/significant_figures_chemistry_if8766_answers.pdfIn PDF document text
    • http://juwesuzibu.epizy.com/bharathidasan_university_convocation_application_form.pdfIn PDF document text
    • http://lanuvurunipa.epizy.com/31434958984.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
font_00_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 3656 bytes
SHA-256: 38ca959a22c9978af7e49d0681804bb33f4a8f710dd24fa00d6267caade7c070
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 5180 bytes
SHA-256: 52b71610cf5d247d02c32dfba98c9d4cc40f473c2cdf91d8c015bcb62c381eed
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 11024 bytes
SHA-256: c415f707482b46b56ef63471c0415b2c3bd9377c7041f4e2f9ce537709089ed8

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