Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a737c828301747…

MALICIOUS

PDF

81.6 KB Created: 2021-03-20 07:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9c8fe69cea50c026fdf3f08612e910a SHA-1: b72a49e6d59c880c70cf97e96add12a942a9ec65 SHA-256: b4a737c828301747c8b489a7eba5056752240f43a5a942523c165f125c8eab53
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 0.9997

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://zajinet.ru/strik?utm_term=compare+3nf+and+bcnf+in+rdbms PDF link annotation
    • https://cdn.sqhk.co/wotezowedo/ghgjiaQ/siziza.pdfIn PDF document text
    • http://3bki.ru/hybrid_athlete4becj.pdfIn PDF document text
    • http://vorecan.space/277653830428ypu6.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/comUigP/dog_breed_dachshund_chihuahua_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/vifaduvej/iogdhci/10412714726.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/igjfXih/tizudowerib.pdfIn PDF document text
    • http://zuluguvo.iblogger.org/54970039009.pdfIn PDF document text
    • http://sazewipeti.iblogger.org/japafasof.pdfIn PDF document text
    • http://metryck.info/prentice_hall_foundations_algebra_1_form_g_answersnmvpj.pdfIn PDF document text
    • http://itgermany.net/the_wisdom_of_insecurity_summaryoae9o.pdfIn PDF document text
    • http://effektzhizni.ru/bored_button_emoji_quiz_answersr12xt.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/chihhvN/wagiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_e7df117ff1f34ea5a0b78be1a9b7ca29.pdf?index=trueIn PDF document text
    • http://xafekejo.epizy.com/certidumbre_riesgo_e_incertidumbre.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_34e894074ebb47219e0dee92f470c47c.pdf?index=trueIn PDF document text
    • http://xuperaletofigaz.epizy.com/resagemoj.pdfIn PDF document text
    • http://fumojaw.epizy.com/topedena.pdfIn PDF document text
    • http://zasegusof.epizy.com/admin_login_form_in_c.pdfIn PDF document text
    • http://jibisisejuw.rf.gd/cb_insights_global_fintech_report_q2_2019.pdfIn PDF document text
    • http://lapobikajedive.rf.gd/baruzili.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 5476 bytes
SHA-256: f0d7f3b054f1e8acaf15bb1bf2a8a22b0f88cee99f3d4a0edce083eb3c42b3f1
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 11064 bytes
SHA-256: 750ccb7b92167bb7c2ec5b04444211d364b6fe246f033862be52e350bd1ed731
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16124 bytes
SHA-256: 832889d8c48d75dd84c0b0116717057421eb9a0a27a3506e1e6a93688515df8e

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